Zan, If you and your muslim friend are still labelling each other with your respective religions then what have you really proved? Only if you can drop all thoughts of religion when you talk to each other and shoot the shit about any subject without worrying about it, then it will be a friendship. Your religions should be irrelevant to your interaction.
It's not immoral to eat meat, abort a fetus or love someone of the same sex...I think that about covers it