Question:
If we come to the Lord to receive Salvation, we become a part of God's family; am I correct on this? If this is so, then why do some Christians act as if they are perfect and not fully accept new Christians?
Answer #4:
You are absolutely correct on how one becomes part of God's family ("But to all who did receive him, who believed in his name, he gave the right to become children of God." John 1:12). All that is required for salvation is repentance of sin and faith in Jesus Christ. As to the second part of your question, all I can say is that I'm sorry to hear that people who call themselves Christians can be so unloving. There is no reason for a Christian to be judgmental and un-accepting of new believers; that is sin.
Jesus said the overriding characteristic of Christians should be our love for one another (John 13:33-34). Now this is different than rebuking a sinning Christian. If someone says they are a Christian and also admits that they are having an adulterous affair, Christian love dictates that we confront that person with their sin. But if a person is a new believer, there is no way we should expect that person to be instantly holy in their living, or to know everything that is involved in the Christian walk. Older, more mature believers need to lovingly come along side newer believers and disciple them, not judge them on their past life. It pains me to see the people of Christ doing what you described.