That's your opinion, not shared by him, and not by all Jewish people.
Perhap's it's just a Noahcide failing?
ZC: “Doing so is a slap in the face to Torah,G-d Himself and the Jewish people.”
Cronos: “That’s your opinion, not shared by him, and not by all Jewish people. Perhap’s it’s just a Noahcide failing?”
Well, an observant Jewish person should not take an oath on a Chrisitan Bible because, bluntly, the additional chapters are considered heretical and false. Taking such an oath gives the appearance of accepting said teachings as true, which is against the duties of an observant Jewish person who deems said teachings false.
Be a bit like you taking an oath on the Bible which includes later chapters from the Book of Mormon or the Koran.
Personally, if I was a Christian and saw a Jewish person taking an oath on a Christian Bible, I would be thinking to myself that the persona taking the oath didn’t take it seriously, in that he rejects 1/3 of the book he is using as false.
As it is, this guy probably should have used Mao’s Little Red Book, maybe something by Marx, or Darwin’s Origin of the Species, as any such are more meaningful to him than anything Divine or allegedly Divine.
It is not opinion. It is the truth.
No true Jew will be OK with taking a vow on that bible.