"I do my own thinking and I form my own beliefs about God."  You've nailed it.  That's what Christianity is all about.  Taking the information offered in God's Word about Christ's work on the Cross, thinking about your own life and forming a belief in the transforming power of God to take the mess you've created and letting God remake it in His image.  And if you read the Bible carefully, you will realize that believers are called to be stewards of this Planet.  I take that seriously and I hope you do, too.