Breifly, to answer questions posed.
God created me this way. No. No one is created gay.
It was misfortune that they were born into: We are all born in corruption.
Unfortunately God made me gay. No. God did not make you gay.
I can't do anything about it. Yes. You may receive a new birth.
Its God's fault that I sin. No. One makes a choice to sin.
Since they were created that way,it must not be a sin. It is a sin because it transgresses the law.
What does Christianity hold about the way people are created? I would like to believe that they hold to the bible account. However, honestly, I have no idea
Does having something in our nature make it not a sin? No. A sin is a sin, until such time that the law is changed, it remains a sin.
How were we created? All scripture taken from KJV
Genesis 1;27
So God created man in his own image, in the image of God created he him; male and female created he them.
Genesis 2;7
And the Lord God formed man of the dust of the ground, and breathed into his nostrills the breath of life; and man became a living soul.
Genesis 2;22
And the rib, which the Lord God had taken from man, made he a woman, and brought her unto the man.
Genesis 1;31
And God saw every thing that he had made, and behold, it was very good. And the evening and the morning were the sixth day.
I believe that the creation as God said, was very good.
The Fall
Genesis 3;13
And the Lord God said unto the woman, What is this that thou hast done? And the woman said, The serpent beguiled me, and I did eat.
Genesis 3;15
And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.
Genesis 3;16
Unto the woman he said, I will greatly multiply thy sorrow and thy conception; in sorrow thou shalt bring forth children; and thy desire shall be to thy husband, and he shall rule over thee.
Genesis 3;19
In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou art, and unto dust shalt thou return.
We have three involved in the fall, Adam, Eve, and the serpent.
The family after the fall is corrupt, it no longer is pure, but now has the taint of sin.
Genesis 4;1,2
And Adam knew Eve his wife; and she conceived, and bare Cain, and said, I have gotten a man from the Lord. 2 And she again bare his brother Abel. And Abel was a keeper of the sheep, but Cain was a tiller of the ground
Hebrews 11;4
By faith Abel offered unto God a more excellent sacrifice than Cain, by which he obtained witness that he was righteous, God testifying of his gifts: and being dead yet speaketh.
I John 3;12
Not as Cain, who was of that wicked one, and slew his brother. And wherefore slew he him? Because his own works were evil, and his brother's righteous.
The two offspring of Adam and Eve, represent good(righteous), and evil(unrighteous). One is not corrupt, and one is corrupt.
The Heart. We are guided by the characteristics of our heart.
Jeremiah 17;9,10
The heart is deceitful above all things, who can know it. 10 I the Lord search the heart, I try the reins, even to give every man according to his ways,nd according to his doings.
As long as the heart remains tainted, we are all susceptible to the wickedness therein.
Romans Chapter 1, verses 18-32 provides some description of homosexual acts as well as other perversions. Leviticus Chapter 18 speaks of homosexuality and other sexual sins. Satan has had great success in infiltrating the world with evil. As noted in the bible, good is being called evil and evil is being called good. The truth of homosexuality is not happiness as promoted, but eternal death
Ephesians 2;10
For we are his worhmanship, created in Christ Jesus unto good works, which God hath ordained that we should walk in them.
Romans 7;18,19
For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not. 19 For the good that I would, I do not: but the evil which I would not, that I do.
Believers are a product of the Holy Spirit, unbelievers remain tainted.
Matthew 7;17,18
Even so every good tree bringeth forth good fruit: but a corrupt tree bringeth forth evil fruit. 18 A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.