When it comes to people who question "the scriptures" you have to ask the following questions.
- Who are the "many people?"
- Which "the scriptures" do they question?
- What exactly are their questions?
- Have they searched within Jewish sources for answers or strictly Christian ones?
- If they have checked Jewish sources - have they done so across the entire Jewish spectrum of ancient Jewish communities? (Mizrahi, Yemanite, Sephardic, Maghrebi, Ashkenazi)
This would be the starting point of such a question or consideration. Personally note, most of the people I know who "question" Jewish history often have a limited view of Jewish history and often ignore whole swaths of it. Some I have seen do so in order to come to their conclusions.
In terms of what I beleive, I look at it from a different perspective. I "know" how to ascertain the truth until the system that has come from Har Sinai is systematically proven wrong using the correct disciplines to do so. For us Jews who hold by Torath Mosheh it is not the text that determines what the truth is - it is the historical oral and written mesorah (transmitted information) that we use to determine what the truth of a matter is.