He is a satanist

So me and my fiance have been together for about 5 years and he was always a catholic and I am Christian, recently he has came out to me that he was a satanist and it absolutely broke my heart. He now wears a pentagram necklace and reads the satanist bible and tells me stuff about it. I try so hard to accept him as he is because I love him so much and because we are about to have a baby together. I just don't know what to do, I need advice on how to be more accepting and not let it bother me so much.