I come from a Muslim background so maybe I can shed some light. According to Islam technically as a Muslim man he can marry women from the Abrahamic religions. However this all depends on how religious he/his family is. Some of the non-religious men/women don't really care. Even in that case it boils down his family as well. In most cases parents are usually conservative and you'll face a lot of resistance trying to get accepted in his family. It is not uncommon for Muslims that are dating outside their faith to hide their relationship from their family and will only bring it up when they start getting 100% serious about you and want to marry you.

When it comes to children that's a whole different ball game. Even if he wasn't religious he would probably want his children to be raised as Muslims as you would like to raise them as Christians. That would be something you would need to talk to him about and whether having children together is an option without fighting.