<human>: Give me a shortened version of the text

Been discussing moving in with my GF and her brother for about 6 months now. We have been looking for places to live and we finally found a great place that's both affordable and meets our wants/needs perfectly. 

We're both in our mid-20's and she's never lived outside her parents house before so this will be her first step away from them. She's agnostic and I'm an atheist while her parents are Roman Catholics (Her father is actually a deacon). Her parents don't know of her lack of faith in their religion and it's not something we're prepared to discuss with them yet. Her parents are wonderful people and extremely supportive to their family and community and helping people where they can.

My GF discussed with them privately last night about moving in with me and they both immediately voice their concerns stating that they would prefer marriage come first before committing to a place together. They're is no conflict yet though but I'm sure when I'm over there tonight, there will be a big discussion.

How should I address with them that I feel that moving in with her is ultimately a big step for me as I don't commit to living with someone lightly and eventually becoming common law prior to marriage. I'm not pressured by their religion but marriage is not something that I'm prepared for and my GF understands this fully. She's prepared to move in if I ask her regardless of her parents but I also don't want to cause any tension between us as a result.
<bot>: Parents want us to marry before moving in together, I'm not ready for marriage but want to somehow convince her parents it's the right thing to do.