You definitely dodged a bullet.

In my experience, religious compatibility is vital to a relationship. Spiritual beliefs are, for many people including myself, an essential part of who we are. It should never be changed just to please somebody else. Which means that she shouldn't be expecting you to convert, but then neither should you be expecting her to renounce. The problem is, indeed, incompatibility. Both of you have a relationship (with yourselves and your own convictions) that matters more than the relationship you might have had with each other.

That sign-a-contract-before-baptism thing sounds scary, by the way.