Yeah, that’s stupid and wasting time. I wouldn’t say it’s sinful to date non Christians, but it’s definitely sinful to marry them. Therefore missionary dating is a gamble. Ironically, I have heard of guys who converted, and the first time they went to Church was because they knew a girl they had a crush on had the requirement that they were Christians, so they gave it a chance. But they weren’t missionary dating, it was moreso them being led into church by having a crush on a parishoner, lol.