Vegan dating a meat eater
As long as my SO is respectful of my lifestyle, and does not require meat/dairy/eggs at every meal, I am alright with a nonvegan. I just happen to have gotten lucky with my boyfriend being vegan and atheist.
I am also a vegan (and have been for 12 years) who is dating a non-vegan.
With that being said I could easily date a religious person as long as they were accepting of my atheism.
A personal belief system does not affect others (unless you force those beliefs onto the lives of others) but in itself, a personal belief should ideally not affect anyone else.
I would suggest having a discussion with him to explain how important it is to you.