Here is an excellent sermon by John MacArthur and a few question and answer sessions on church and how to choose a church. They are very helpful and encouraging and pertain to my previous post. I would have a hard time recommending that someone should leave a church...it is a very serious thing...but,I do think as believers we need to examine this issue and think heavily on it, while all the time taking it to the Lord in prayer. We must seek God's wisdom in this area.

This is helpful.

This is encouraging for those in a church that may not be the best situation.

This is an excellent question and answer.

Go here and also read this.