Just so there's no misunderstanding here, I'm not trying to debate whether a person's belief system is right or wrong.

Since the existence or non-existence of God can never be proven either way, it's rather pointless to debate the question, anyway.

AFAIC, people are free to believe or not believe whatever they wish, and I absolutely respect their right to do so, regardless of how I personally may feel about what they believe and what I believe.

I'm simply trying to understand some of this.

Not being at all religious, this idea about the NT superceding the OT, and the laws in the OT not being applicable anymore is new to me.

Asking how we are to know what from the OT still applies and what doesn't is a fair question, which, I believe, Lavinia answered.

"Difficult....not impossible"