There is a story in the Bible that Adam and Eve ate the fruit and sinned against us god. But other religions, including some Christians, describe that they were having intercourse and that's why God threw them out of the garden. Which Christian groups believe this, and what is their reasoning?
I believe that you are referring to the theory that the original sin was sex. This, however, is not Biblically true. Before the fall, God said:
How could they multiply if sex was a sin? The original sin, according to the Bible, was disobedience. (See Genesis 3)
EDIT: Because the question was edited, my answer has now been edited too. I have ran into a few people, mostly from the Catholic faith, who believed in this teaching. As far as I know, this is not Catholic doctrine, they just had been misinformed.
Please follow the link below. The fall was indeed caused by the first ancestors, when Adam and Eve engaged prematurely in sex, before they have reached maturity (be fruitful):
Below is the full explanation of the fall according to the F.F.W.P.U. (aka Unification Church):
This story comes at the very beginning of the Bible. According to the story, the Garden of Eden was the dwelling place of the first man and woman, Adam and Eve. There were also two trees in the garden’s center, the Tree of Life and the Tree of Knowledge of Good and Evil.
There was also a serpent that tempted Eve to eat the fruit, and she then gave it to Adam. This is more than just a story. It is full of symbols.We know serpents can’t talk, much less tempt human beings. What could the serpent symbolize? Revelation 12:9 speaks of an ancient serpent saying: “The great dragon was thrown down, that ancient serpent, who is called the Devil and Satan … and his angels were thrown down with him.”
From this we can understand that the serpent is actually a spiritual being, a leader of angels, an archangel that was thrown out of heaven.
The Bible, as well as other sacred texts, reveal his name to be Lucifer, an originally good being who fell and came to be called the Devil and Satan.
We already explained about the spiritual world and mentioned angels. Angels look like people, but have no physical body. Human beings are God’s children, but in Hebrews, angels are identified as God’s servants. (Hebrews 1:14)
What about the two trees? You can’t buy a tree of life or a tree of knowledge of good and evil at your local garden center. Throughout the Bible, trees, branches, roots and vines are used as symbols of people, and Divine Principle teaches that that’s the case here as well. The two trees represent Adam and Eve.
These two trees, the Tree of Life and the Tree of Knowledge of Good and Evil refer to spiritual life. We know this is so, because God said that the day Adam and Eve ate of the fruit, they would die. But their physical life continued. So the life in these trees was spiritual life; the tree of life represents a person of spiritual life – a person who has fully inherited the love of God.
Let’s look at the Tree of Knowledge of Good and Evil. One meaning of the word knowledge is awareness, and the Bible often applies this in a sexual relationship. Genesis 4:1 says, “Adam knew his wife Eve and she gave birth to Cain.” So knowing Eve was to eat the fruit, or to have sex with her. Eve was the Tree of Knowledge, whose fruit was not to be eaten prematurely.
If Adam had matured and become the Tree of Life, then he would have loved Eve as the Tree of Knowledge of Good, uniting us with God. Partaking of this fruit prematurely and selfishly turns it into the Knowledge of Evil, separating us from God. Thus, the fruit of the Tree of Knowledge symbolizes sexual love. An archangel, Lucifer, selfishly seduced the immature Eve to “eat the fruit,” to unite with him through the sexual bond. Eve in turn seduced Adam to do the same. The results testify that this is true. After Adam and Eve ate, they covered not their mouths but their sexual organs, because it was there that they fell.
Ever since, sexual immorality has been our downfall. It seems that the more prosperous we become, the more sexual immorality tends to corrupt us, leading to family breakdown and social decay.
How could this have happened? It started with the angel’s motivation, which was jealousy. God had created the angels as servants, whereas the man and woman were God’s children. A mature Adam and Eve would have mediated God’s complete love to the angels. But while they were growing, they could not yet do so. The Bible describes Lucifer as leading the angelic world and beloved by God as a servant. When Lucifer saw that God loved Adam and Eve as His children, he naturally compared his status with theirs and felt a lack of love.
Seeking to compensate, he looked toward Eve. Her beauty stimulated his love as his jealousy grew. Over time, using charm and deception, he convinced Eve to engage with him in the act of love.
Through this violation of the Principle, Lucifer fell and became Satan. By this relationship, Eve was also changed. She gained the knowledge of love shaped by a selfish archangel. She was conscience-stricken with fear and guilt.
She gained the knowledge that it was Adam who was meant to be her husband. Wanting to erase what had happened, she went to Adam. It wasn’t to confess, but to use him as a means to restore herself. With the same selfish love that she had experienced, she seduced Adam.
Here we make an important point: the fall of Eve with the archangel was spiritual, whereas the fall of Eve with Adam was physical. We will later discuss the significance of these two falls. But the essence is that love should have begun with giving, instead of with taking. What happened next? God immediately offered them a way to take responsibility for what they had done. However, when He asked Adam, Adam blamed the woman. When he asked Eve, she told God it was the archangel’s fault. God’s ideal of creation was for the first family to be a seed that was to become a great and beautiful tree. Every leaf would inherit the same love, connected to the same root. Nothing could be repaired at that time however. Adam and Eve abandoned God, and their children were born to a godless, dysfunctional couple. The first child murdered his younger brother.
Divine Principle teaches that that complete lack of love has been the foundation of everything we see today. Adam and Eve’s immature love has been repeated throughout history.
Think of Adam’s family as the seed of a lemon tree, when the tree that God wanted was an apple tree. How would one change a lemon tree into an apple tree, when all you have to work with are lemons? The answer is, you can’t. The only way to get an apple tree is to find an apple seed.
In other words, to solve this root of all problems, God needs to plant a new seed. This is where the concept of the Messiah originates. Following His own principles of creation, God needs to bring into the world a new Adam, a person God can claim to be His true son a person whose wife would be considered by God as His true daughter and whose children would be born of God’s love.
The first parents, Adam and Eve, became false parents. The world needs True Parents. If we have such True Parents the rest of us can be adopted into their family tree. Or using the analogy that Jesus gave us in John 15:5, we can become the branches of the true vine.
What are some of the lessons from this story? First, Rev. Moon wants us to know how painful this was for God. Nothing can be more painful to parents than the suffering of their children.
Second, we need to acknowledge that love has a proper order. The order of love spells the difference between life and death. Third, we have to pray about this. If we pray about it and open our eyes, we can see evidence of the fall everywhere.
Matthew 15:16-20 Are you still so dull?” Jesus asked them. “Don’t you see that whatever enters the mouth goes into the stomach and then out of the body? But the things that come out of a person’s mouth come from the heart, and these defile them. For out of the heart come evil thoughts—murder, adultery, sexual immorality, theft, false testimony, slander. These are what defile a person; but eating with unwashed hands does not defile them.”
And behold, We said to the angels: “Bow down to Adam” and they bowed down. Not so Iblis (Satan): he refused and was haughty: he was of those who reject Faith. (Quran 2: 34)
Fourth, we need a Savior. But not only a Savior as the son Adam failed to be, but also as the daughter Eve failed to be.