Help

Hey there, I’ve been stuck with the dilemma for a few months and I really need some help.

When you look at the Old Testament, God commanded for many wars for just purpose. But then when you look at the new Testament and you see Christ, does that mean that it is a sin for a Christian to serve as a soldier or a police officer or fight back in self-defense?

I feel like if I get this wrong, then I will go to. Hell I’m really not sure what to do.