Doing it to please the parents, with religion being at the helm will undoubtedly cause issues for both, and the parents will do what they can to stick their nose in your business.
You don't have to push it, but tell him, no good may possibly come out of it.
IMO, heartbreak waiting to happen.
This is between him and his GF. It is wiser to do this for her and her only and no other external reason.
As for 1 yr being too short, I'll leave that to those has actually been married for a while(or been with someone longer).
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