To the OP.... if he is your friend but you are not interested in religious conversations, then simply tell him that and ask for him not to discuss it with you until you are interested in talking about it or want to know more about his beliefs. At the end of the day it doesnt matter if he believes in YEC, OEC, or is an athiest. If he is a friend, then take him for what he is.
Sir Isaac Newton is one of the greatest scientists we know yet he firmly believed in Young Earth Creation. Does that make him stupid and a moron like everyone in this thread is suggesting ? No, it just means he had a different believe system yet it didnt change what he accomplished in life. When it comes to religion, politics and music , you will have all sorts of differences but for the most part it doesnt change the type of person they are.