Of late I have chosen to believe in The Lord, but still I have not joined any church. I am curious about whether is it necessary to join a church? What reasons are there to meet with Christians? Indeed, from time to time I voluntarily help people and lift the depressed whenever I have the opportunity to.
closed as off-topic by DJClayworth, Flimzy, David Stratton♦ Jul 31 at 11:10
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Christianity is about having a relationship with God.
The most important aspect of Christianity is knowing God. (John 17:3) This is the goal, for our broken relationship with God to be restored through Jesus. This doesn't require the church. It certainly is possible to be a Christian without being a part of a Christian community or church. We were created to live in community (Genesis 2:18), so to live as God intends, we ought to seek out Christian companionship. Being a part of a Christian community is the only way that Christianity is presented in the New Testament. One way of doing this is by being a "member" of a local church. "Membership" means different things to different groups, but being part of a community of believers, when possible, is the goal.
Consider what Christ said to John the Baptist when we went to the river Jordan to be baptised:
Christ went to John the baptist to be baptized, not because he needed to be cleansed of his sins, Christ had no sins, but because it was necessary, "to fulfill all righteousness."
If it was necessary for Christ to be baptized, then it is also necessary for us. Ordinances such as baptism are performed by the power of the holy priesthood, which is why Christ went to John the Baptist. John was a Levite, a descendant of Aaron, he held the Aaronic Priesthood and the authority to baptize unto the remission of sins. Baptism is the first of several ordinances that must be performed in order to return to our Father in Heaven, and these ordinances and priesthood power only exist in God's Church.
If you are unsure of which church to join, look to the scriptures for guidance:
Your question is very similar to the account of the prophet Joseph Smith. He was 14 when he decided he wanted to join a church, but did not know which to choose from. He was impressed by the scripture above to petition the Lord about which church to join. His account of what happened can be found here.
To understand the Church, the New People of God, one needs to understand the Old, God's People Israel.
God therefore constitutes a people and makes a covenant with them.
The belief in the Holy Catholic Church is an article of the Creed [/Faith].
What follows are the pertinent Q & A from the Penny Catechism, 83 thru 88
Approaching it from belonging to a People, God's own household, there is then an understanding of the significance of these words in the Old:
Cut-off from the[/your] people.
Gathered to his people.
In the Old: to give drink to my chosen people, the people whom I formed for myself that they might declare my praise. [cf. Is 43:20-21 (RSVCE)].
In the New: But you are a chosen race, a royal priesthood, a holy nation, God’s own people [Gk a people for his possession], that you may declare the wonderful deeds of him who called you out of darkness into his marvelous light. Once you were no people but now you are God’s people; once you had not received mercy but now you have received mercy. [cf. 1 Pt 2:9-10 (RSVCE)].
From a catholic perspective, the belief in the One, Holy, Catholic, and Apostolic Church, and belonging to it is required for salvation, and therefore it is not possible to believe in the LORD without joining the Church he established.