If you visit a church or attend a church that is not feeding your need, you are free to select another church. Ask God for guidance in selecting a church. Let's not assume that all churches are like the one, ten, or thousands of churches that you have visited. Pray and put it before God.
I don't know about this 'ALL' because I have NEVER said that, BUT, I know for a fact that me, on my own, can't stop sinning. But that is the beauty of it. I can stop sinning because of the strength that God provides. It's a daily battle and one I fight with God leading the way. When I say I know God, I'm saying it because I actively seek a relationship with Him on a daily basis and am committed to being obedient to Him and only Him.
The bottom line is that you go to church to fellowship. You go to praise God together. You go to learn and have your spirit edified. 1- No matter who it is, NO human is exempt from an attack from satan. Everyone has their weaknesses and as humans, at times we fill falter. To sit and point a finger at a minister or church member for their mistake is un-Christlike. Whether u go to church or not. We are no one to point fingers at anyone because we would not like it if fingers are pointed at us when we fail. No matter how big or small. Our responsibility, as a family in Christ, is to help them by praying for them. Not acknowledging their faults and saying, " see, and he calls himself a Christian?" NO ONE is exempt from falling flat on their face and making a mistake. 2- If you know of another church members adulterous affairs from other than them, or if you go to a church and know all the business before you get there or learn it before you leave, then YOU were not there for the right reason.... You can't control what another person says or does but you can control your own actions. You are there to worship and fellowship but if someone's idea of fellowshiping is trashing, gossiping, etc., then you have the obligation to correct them nicely and remove yourself from the situation. And if the problem is from the pulpit, as I said, ask God to take you elsewhere and He will. But we definitely have to stop trashing the church, any church, or religion. Change begins with us. Instead of abandoning ship, we should be the example.
To follow Christ is to be obedient. He has outlined what he expects from us in the bible. If the bible seems confusing, pray for discernment. Ask God to help you understand what He is saying in His Word.