From what I've seen in Malaysia
, religious Protestant Christians take Paul's command "Do not be unequally yoked with unbelievers" in 2 Corinthians 6:14 as literal word of G-d that must be applied today.
This means marrying non-Christians is strictly forbidden. Some girls even go further and say they won't just marry a Christian man but he must be a G-dly man. I.e. must be super committed to the church, attends bible studies, preaches, go on missions etc.
Setting such a high requirement for their spouse means most of these women end up single even in their late 30s.
In Catholic Christianity, you see more mixed marriages. Catholic with Prostestant, Catholic with Hindus, etc. In some countries, even Catholic with Muslims.
These marriages are not encouraged but not forbidden because Catholics interpret Paul's command as only applicable to that particular time period. I.e. there was a strong competition for followers between Paul and other religions at that time. Imagine a Church and Temple fighting for followers.
However, a Catholic marrying a non-believer means the marriage is non-sacramental. It ultimately depends on how deeply religious the person is. Obviously, marrying people from different faiths will result in argument over which religion their children will follow.
You speak enough Christianese to identify you as Christian. Are you?