I am going to give you a sword and shield for any Christian that comes at you. First you ask do you believe in the word of The Most High? If so then have them read this verse for themselves.

Numbers 25 actual wording
19 YHWH is not an ish, that He should lie; neither a ben adam, that He should change His mind; hath He said, and shall He not do it? Or hath He spoken, and shall He not carry it out?

Numbers 23:19 kjv
[19]God is not a man, that he should lie; neither the son of man, that he should repent: hath he said, and shall he not do it? or hath he spoken, and shall he not make it good?

Then ask if he gave us dietary laws, he would not go back on it. This would be him repenting on his word.

If they say the laws are done away with, this would also be The Most High repenting.

YA is not changing his word in the new testament your religion is changing his word and that is a sin!