It's been a while since I read the OT laws especially the ones related to what was allowed to be eaten etc. Some OT laws applied to Jews, some to Jews and those living in their household, and even included their animals. Too broad a subject to go into piece by piece.
You are taking some things way too the extreme. I know of a church very popular in this nation. It believes in the manifestation of spiritual gifts. They believe ones salvation is proved by the person speaking in tongues. Are they Christians? Yes. misguided but Christians. Some of that sect still believe members in their church are given prophecies. You likely know it as The Church of GOD. Services and church policies can vary greatly from church too church. You want to go condemn them all? You disagree then stay away from them and leave them be. GOD through The Holy Spirit in time will bring correction but likely not you.
Not my problem. Please stay on subject: MORMON HERESY.