An excuse for going to church by those who don’t attend on a regular basis is that the church is full of hypocrites people who don’t live up to the standards of the Bible.
Why would this be? Why wouldn’t God just fix everybody who goes to church so that everyone can be the shining example a good Christian ought to be? Why do Christians get themselves in trouble by sinning?
Christianity is a belief in something: it’s a belief that we were out of fellowship with God and God wanted us to have the possibility of being in fellowship with Him. Making sacrifices for sin wasn’t sufficient, so God sent His Son who became the ultimate sacrifice on our behalf. All it takes to become a Christian is to acknowledge one’s own sins, to ask Jesus Christ to come into your heart, and to believe in what Jesus did on our behalf.
People have come to Christ on their deathbeds, not having used their lives for the glory of God at all. It is clearly stated in the Bible that we are saved solely by faith:
 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast. Eph. 2: 8-9
If you think about it, this makes total sense. After all, what work of a human being is truly good enough for a mighty and perfect God? What painting, poem, piece of music, human act is not tainted in our hearts somewhere by selfish thoughts? We create for the glory of God (and most people add in parentheses that a little glory down here would be nice). We seek recognition and material “pay” of some sort (audience, money, admiration, status) when we do things–this is the human condition.
So we are saved by faith alone.
At the same time, God expects us to grow in our Christian walk. The Apostle Paul makes this very clear:
 And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, even as unto babes in Christ. I have fed you with milk, and not with meat: for hitherto ye were not able to bear it, neither yet now are ye able. For ye are yet carnal: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men? 1Cor. 3:1-3
In what direction do we grow? Out of selfishness and toward God.
So, at any given moment in any church, there may be a range of people on the journey towards God’s ways. Some people are further along the way than others, and some churches are not able to help people move particularly far along that path. Some people don’t realize where they are on the path and they don’t know that they need to move Godward. Some people rest along the way temporarily and some people rest in a certain spot permanently. Some people seem to have a lot to conquer in terms of their selfishness and some are able to let self go with relative ease.
Why doesn’t God just fix us, then, when we declare our belief in His Son?
God gave us the choice to believe in Him and He doesn’t remove choices when we become Christian. Every day He gives us the choice to move towards Him or away from Him. Every moment we have that choice.
The process of moving toward God is a process of increasing faith and of maturing both spiritually and in terms of our natural selves. Paul points out that we are all carnal, but as we move towards God, carnality becomes somewhat less able to rule us. We can often (but not always) make better decisions with practice.
So why are some Christians (why are all Christians) hypocrites? Because we are human and in becoming Christian we have not lost our humanness.