When it comes to Christians turning their back on the faith, in my own experience I have found the following reasons among some of them:
1) Getting talked out of it at an educational institution and being too shallow of character to pray about the matter and hunt for the truth.
2) Same as above but welcoming the so called faith troubling information because it suits the life style they wanted to live anyway.
3) Pornography and other sex fun stuff. Rather than being willing to walk humbly and see God’s forgiveness even however often, isn’t it just easier to just swim in sin? Of course it is!
4) Being bored to death at church or by different Christians.
5) Being hurt by people who claimed to be Christians.
6) Loneliness and pursuing wrong relationships.
7) Just good old fashioned Satanic pride.
8) A way to get back at family or friends they resent.
9) Being raised with twisted biblical beliefs about and expectations from God. etc. etc.
It has been said that the only argument against Christianity is a bad life. Another perceptive statement is "Christianity has not been tried and found wanting; it has been found difficult and not tried."
That being said, it is especially hard to turn to the Lord again because it means the very painful experience of admitting again that we were wrong and humbling ourselves anew. Yet, hard as it is, this does happen thank God. Along with praying for the soul in need, I must remember to try to assist in meekness as states 2 Timothy 2:25,26:
"In meekness instructing those that oppose themselves; if God peradventure will give them repentance to the acknowledging of the truth;
26 And that they may recover themselves out of the snare of the devil, who are taken captive by him at his will."
There is a spiritual war going on and the battle may be long and discouraging. We must lift up one another and be willing to be corrected, not providing any hindrance for an erring soul to return as we ourselves may have dry spiritual hearts at times but not have it manifested by apostasy.
We know from looking over the whole counsel of God that there are no guarantees of a wandering one returning home and there are faithful children that come from nominal Christian parents. However, when the time is right, God forbid that we should ourselves be a stumbling block to their return whether they be family, friends or otherwise.
If you are one who has turned your back on God this website is full of technical answers but I plead with you not to risk your spiritual future on an offence or pride of your own heart as we all have. Is a moment of pleasure, an attitude of anger, or whatever the issue my be worth the risk?
Even if everyone who is a Christian is a hypocrite, it is still not worth turning your back on Christ. Better to walk with God alone in the world with Him who gave His life for you and yearns to have you return. Look not to any other person Christian or not, family or not. Look only to the Lord Jesus Christ. This world is nothing more than the Titanic. It is sinking. Your life at best is short. It is not a time to blame people for your ship hitting the iceberg. It is time to get in the Lifeboat before the icy waters fill your lungs and you meet your Maker.
I am sure many of you have wisdom to share in the painful matter too many of us have been involved in.