"He has told me if I ever want him to go to church with me "just ask" lately I just asked him to join me for Jesus Supper tonight and my baptism in a few weeks. He said he would go."
He TOLD you to give him an invite if you wanted him to attend.
You invited him.
HE TOLD YOU WHAT HE WAS WILLING TO DO. Stop making assumptions, stop putting words in his mouth, stop making up his mind on his behalf, and BELIEVE WHAT HE'S TELLING YOU.
You're not forcing him to attend church with you, you INVITED him. If he chooses to accept your invite and then gets all resentful about it, that's HIS issue, not yours. He ought to know better in that case. He's free to say "No thank you" if you invite him to church, and your job is to not bag him about it. Don't make up other people's minds for them (especially after they've told you what they want to do) - it's very rude.
And there's a big difference between him attending regular services on his own, vs. him attending to support you for an important ritual. He doesn't necessarily have to believe in the religion or adhere to it in order to attend the service to support YOU.
Also, do you guys plan to have a family? Have you discussed what (if any) religion your children will be raised in, and what each of your expectations are about baptism and Sunday services? It's fine to be in a marriage where the spouses each have different religious beliefs, but if you plan to have kids then you ABSOLUTELY need to come up with a plan in regards to religion/church services and rituals before they arrive on the scene. Otherwise you're in deep shiiiiit.
"My fiance is a antogonist."
Do you mean "agnostic"? An "antagonist" (note spelling) is "a person who actively opposes or is hostile to someone or something; an adversary."