If religion is important to you, but not to him, why would he insist that you marry in his church? Just something to consider in this discussion.
I would imagine that a marriage in which one spouse mocks, even lightly, the other person’s belief is not strong marriage for either person. Interfaith marriages can work, but only if each side has respect for the other. I don’t know that I could be in a long-term relationship with someone if they mocked my beliefs.