Paulapollos,
Thanks for your questions...and I don't pretend to have answers beyond my very simplistic viewpoint that we live in an imperfect world populated by imperfect humans creating imperfect interpretations. Using that premise, I could use the same reasoning regarding science. There are absolutes such as gravity, physical laws, etc. and there are theories and hypotheses that require a certain degree of faith as part of accepting them. I cannot with a certainty tell you that the universe is infinite...or what the origin of life is...or if there is life on other planets, etc. The leap to certainty on any of these and many other subjects require a dgree of faith in accepting how they were established. I see the questions you have regarding the Bible, Jesus and his return, etc. as requiring that same type of faith. I don't think there is a black and white proof regarding any of these subjects. I can only rely on what makes sense to me and how that works with my belief system. There will always be someone with an opposing viewpoint there to de-bunk the other side's position...imperfect men create imperfect analyses, and thus will always be subject to criticism and dissection creating doubt in the mind of the hearer.
TYA