fw707 - I will do my best to go through your list.
Rick Warren - I live a few miles from his Church. He preaches a watered down message that only focuses on the happy parts of the Bible. His incomplete messages are mostly man centered and shallow to keep people in the pew donating money. I have a real problem with his embrace of Islam. Islam is evil. Allah is not God. Allah is a demon. I believe Rick Warren is a real Christian. But, his Church makes me sick.
Joel Osteen - I despise him as a cowardly money grabbing fraud. Even an unsaved person can see that. I question his salvation because he said Mormons and Christians worship the same God. This is not true. If a person does not have the right Jesus, they are not saved.
Joyce Meyer - From what I know, she is a Christian. She is also wrong. The Bible clearly teaches women are not to be pastors. I don't know all the exact details of her theology.
Ken Copeland - This guy is a heretic and a money grabbing fraud. He has taught things that are contrary to the things a person needs to believe to be saved. Run for your life.
Here is the deal. A man is saved when he confesses his sin and believes that Jesus Christ paid for those sins on the cross and rose on the third day. The same Christian can be in wrong on many other things and still be saved. Good examples are Joyce Meyer or Rick Warren. They are hurting people in the process. But, God can even use these people who are clearly wrong to reach the lost. That does not justify their error though.
The Bible is much more than just reaching the lost. You could print the Gospel on a 3x5 card. The Bible reveals the nature of God and his will for our lives. To misunderstand these things can bring a lot of pain to your life and damage to others.
Success in man's eyes is a large church. God looks at things differently. Success is obedience and telling the truth. Bigger is not better. Jesus Christ said the way is narrow.
Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat: Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.
Matt 7:13-14