tl;dr: invite your SO to church with you and let him get accustomed to it at his own pace.
First, to clarify the above post. You don’t have to be confirmed Catholic to be married in a Catholic church, or even Christian, as long as the other partner is Catholic. The Catholic person would typically need to promise to raise any children from the union as Catholic and the non-Catholic is to promise to not prevent that.
You would need to ask your local bishop, through your priest, for permission to enter into a “mixed marriage.” Depending on whether the non-Catholic is a baptized Christian or not, there are certain parts of the full Mass that wouldn’t be performed – or even have no Mass – but this would still be able to be in a Catholic church. I believe it would still be a sacrament (i.e., you wouldn’t be able to receive communion should you divorce), but you should check with your priest and look around online. There are lots of forums on this topic.
For example, this is the text of a wedding to an unbaptized person: http://catholicweddinghelp.com/topics/order-wedding-catholic-unbaptized.htm
I speak as the non-Catholic SO of a Catholic. I was never raised in any religion nor do I identify as agnostic or atheist. However, I do enjoy learning about faith traditions and visiting churches to see the architecture.
My SO goes to church every Sunday and when I’m in town, I go with him. It was rather weird at first for me since it is so ritualized and it felt like everyone knew the script except for me. However, it did help that I understood Christian and Catholic theology enough to understand the references. On my own volition, I read more about the Church and spoke to Catholic friends about it. Eventually, I came to know the Mass as well as any Catholic, and I even go up in the communion line to receive a blessing (but not the wafer or wine.)
It has been several years of me going to Mass with him and I don’t think I will ever convert and be baptized. My SO would love it if I did, but I am too skeptical about the theology, the existence of God, and my personal quibbles with the Catholic Church to become Catholic with good conscience.
However, I am happy to be married in a Catholic church because it is important to my SO and a part of his identity. I am okay promising to raise our children Catholic though I plan on exposing them to diverse faiths as well as critiques of religion in general, and not putting them in Catholic schools. My SO has never made me feel like I had to though, and I think his willingness to let me do what was comfortable for me was what eventually convinced me to do things in his faith tradition.
Thus, I would recommend you start by inviting your SO to church and helping him through the Mass. You may also want to go through the pre-Cana questionnaire (called FOCCUS), which will likely be required as part of your pre-Cana. If he is very turned off by Catholic teachings that may come up as part of weddings (for example, I’m not a fan of the Church’s emphasis on natural family planning), you could emphasize that it is something taught but most don’t practice it nor are you necessarily held to it. Hopefully, he sees your faith as an important part of who you are and will want to support you in it. Don’t pressure him to do anything he doesn’t want to do.