Catholic vs Agnostic - What about our Kids?

Hello everyone!

So, my boyfriend and I have gotten pretty serious in our relationship, and we’re starting to discuss marriage and children.

He was raised and is a practicing Catholic, while I was raised as a Protestant Christian but have decided I am agnostic, and am not currently practicing any religion.

So, needless to say, we’re quite different religious-wise.

Firstly.

We “aren’t married in gods eyes” if we aren’t married in the Catholic Church by a priest according to his faith.

However, Since I was younger I have wanted a beach wedding, by one of my close friends who is legally able to marry couples and has been for a few years.

Secondly, our children are supposed to grow up as Catholic Christians according to the Catholic faith. But I don’t believe in that, since it’s a sin if you’re a catholic and leave the faith even for another branch of Christianity, and I don’t want that to stop them from free-beliefs.

I want to give them their own decisions, and let them be free until they’re old enough to understand what religion is and make their own decisions. And until then, I want to let them be free, as I’m not deciding anything.

Can you guys give me some insight? Anyone else had this issue?