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Depends on what you mean by dating. If by dating you mean going out with that person to the cinema, an amusement park or having a coffee or going to a park for a chat or something like that, then I would have no problem in dating a non-christian, instead, that would be a good opportunity to share the gospel, share thoughts about God and other interesting topics.
If by dating you mean kissing and having a relationship and engagement, then I would not date that person.
If by dating you mean kissing and having a relationship and engagement, then I would not date that person.