Do you believe everyone that professes they are a Christian really is? That is the mindset that has allowed so many to be deceived that true, all in, Jesus in control of your entire life Christians, can be "possessed", "owned", "demonized".
Just because someone is in leadership, regularly attends church, is a pastor, etc., does not mean they are a Christian. Remember Satan's entire kingdom knows the scriptures better than any of us, they know how to manipulate them, manipulate people, deceive, destroy, divide, and conquer those who aren't "all in."
You can't have one foot in one door, and one foot in another, and expect to be saved, as Mark 3:25 shows.
Just because someone "said after me" "Jesus come into my heart" does not make them a Christian. If your life wasn't completely changed after, you might want to examine your motives, as its a change of heart, not just words.