What is it about the way the Bible was written that makes a multitude of people believe the Hebrew God is the One True God and not anyone else from another religion?

I have a childhood friend who recently visited and we got to discussing briefly about my other friends who happened to be Jewish. Both of us were raised Catholics. Went to the same Catholic schools. I’ve known him since kindergarten.

I guess we never talked about religion since I became agnostic years ago and now, he is connected with the Opus Dei or he is Opus Dei? As to what he does for them or what they do for him, I didn’t ask. I have no clear understanding of what Opus Dei is.

When we got to the part in that brief exchange where I said, Jews don’t believe Jesus is God or even Son of God, he replied, So which God do they believe in-? I answered, Well, whoever it was they created. End of talk.

I guess faithful Jews wouldn’t appreciate my answer but right now, that’s my guess. Religion was man’s creation. I might change my mind who knows. I think what I wanted to tell my friend was, Don’t be too sure about your beliefs because they were not originally yours. They were of the Hebrews and even Jesus failed to convince all of them.