Yes, I would, his beliefs shouldn't matter
No, he needs to believe in God, even if he agrees with me
"God is the name by which I designate all things which cross my path violently and recklessly, all things which alter my plans and intentions, and change the course of my life, for better or for worse."
-C G Jung
Christians should be essentially Jews who believe in the divinity and message of Jesus Christ. Thus, every word of the Old Testament has a high degree of importance.
Christian values could be described as an amalgamation of church tradition, the gospel of Christ, and the law of Moses.
Heresy | Define Heresy at Dictionary.com
1. opinion or doctrine at variance with the orthodox or accepted doctrine, especially of a church or religious system.
2. the maintaining of such an opinion or doctrine.
3. Roman Catholic Church . the willful and persistent rejection of any article of faith by a baptized member of the church.
4. any belief or theory that is strongly at variance with established beliefs, customs, etc.
At any rate my intent was to convey the out of bible context that church's assert to control their followers. Which is relevant since the Christian Right is trying to use the Christian Faith to control Americans. By you asserting that there is an out of bible bases that dictates morals indicates that those Christian morals that you are talking about came from humans not gods.