I am a cradle catholic and this is my experience. First wife was another cradle catholic who divorced me. I applied and received an annulment.
Second marriage was with a gal who was United Methodist. She passed away from breast cancer a number of years ago. She was a very spiritual person and had a beautiful relationship with Jesus. She grew up attending Mass with her grandmother. She was closer to God than 99% of the Catholics I know.
My third marriage was with a convert. I really felt good about our relationship. I had the belief that a convert really knew what they were doing. There is a sub-plot here that I won't get into. Anyway she divorced me too saying she never really believed in the transsubstantiation and grew to hate the clergy because of the abuse scandal.
So will I date a non-Catholic? Not really. Even with other Catholics you can get into bitter debates over issues. A convert, maybe. But it's all about what the individual's beliefs are. I am at an age where some things matter a lot more than others. Faith is one of them. I'll put my trust in the Holy Spirit. But I will carefully observe and evaluate what an individual says and does. It is not for me to judge the person, but I can judge the person's actions.