This is a very important thing to pray about, maybe even moreso then someone being sick. I pray that God will help you both to come to an understanding and to be able to attend church together and build a life together.
While you are reading your bible don't forget to read the Books of Acts.
Acts 2
I was raised Catholic also. When I was about 11 or 12, my Mom and I visited a pentecostal church and God filled me with the Holy Ghost. I was speaking in tongues and did not know why. They told me afterwards that it was the Holy Ghost.
John 3
In my later teens, I was invited to another pentecostal church and they showed me in the bible where people were baptized in Jesus name for the remission of sins
Acts 2:28. Even though I had been baptized as a baby in the Catholic church, I wanted to do this and be rebaptized in Jesus' name as an adult.
Acts 19:1-6
God has a way of leading and guiding us to becoming closer to him. It doesnt take away from what we have learned so far, but it adds more.
Pray and ask God to show you more of himself from his word and I know he will.
Acts 17:27-29
God bless you and keep you my friend.