I'm not even Christian and I know that's a load of fucking shit. Leviticus was the old law, what the Jews before Christ were to follow (shit like no mixed fabric clothes, no shellfish because they're unpure, like really weird stuff that was a mix of actual religious stuff, and a bunch of stuff you shouldn't do because bad stuff happens, though since they didn't understand why, they just deemed it a consequence of being unpure/unholy/ungodly/whatever)
But Christians don't follow any of that because according to them, Jesus, being the son of God, essentially nullified those laws and set new ones. It kinda makes sense as the old testament god is a mean bastard while new testament god is a total hippy 'love everyone' kinda person