Exactly Jerry! As the Bible says "man looketh on the outward appearance, but God looketh on the heart." I don't think we can force people to have a sincere heart towards God. It's our job to serve God with all our strength and with all our heart, and through being a testinmony and preaching the Word, God can deal with those that have a "fake" heart towards Him. I believe we can preach about the "false" heart, but when it comes down to it, we have to understand it's between them and God.