The idea of justification seems to be a concept developed by Paul, as there are no original copies of his letters, earliest about the 3rd century. How can you be sure that the true meaning has not been altered or lost in translation?
Touchofgrey, That's the ^^^ question I responded to, obvioulsy.
I'm not an expert on your questions so you would do better with someone else besides me. This site is usually very interesting although i admit to not having read this link. Have a look. https://library.biblicalarchaeology.org/article/did-jesus-exist-searching-for-evidence-beyond-the-bible/
I believe because I have prayed and been answered time and time again. It's not a question for me if He exists- He is very real.
I do understand that you have many questions. I was there too, but with a different set of questions. My faith wasnt shipwrecked because of a bunch of twisted liars- and especially because the WT fits the false teachers warnings in the scriptures all too well. So we were warned in multiple places. That ought to build faith not destroy it, ya know?
Instead, I had to begin at square one with learning what the bible actually said. I didn't trust a single person to help me. ALL that I had was prayer.I would suggest prayer to you as well, and keep at it. He already knows why you struggle, so go to Him. Let Him heal you like he did me. He will stick closer than a brother. What do you have to lose?