The following is rough, but it will capture the kind of general underpinnings that support my belief. If there are questions, I’ll try to tighten things up along the way in whatever answers I can provide to whatever responses are evoked-- I am trying to work this line of thought out as I go along, so I will feel free to rephrase or (outright) modify if I need to.
I believe that Jesus Christ is the son of God, so, of course, I believe there is a God. I have been taught this by people who form a group, members of which group, are at the contemporary ends of chains of people who have been similarly taught by other people who have been taught by others, and so on. These chains stretch back in history to people who encountered Jesus Christ, who made these (initial) people aware of the facts (his relation to God and his status as Messiah.
These initial encounters, along with other significant occurrences, has been documented along the way in ‘written’ material that has been preserved over the ages. To be sure, this documentation is not the documentation that is produced nowadays with respect to current events, which documentation will be available (I hope) to future generations. But then neither is a lot of the other documentation from 2000 (give or take) years ago.
It is true that the material of the Bible has been considered more than just documentation, so it has been preserved, more or less, intact. As a partial analogy, think of famous diaries or journals that have come down to us through history. In some cases they are valued for more than the history they include, and so, are kept intact, as it were. The Bible contains parables, psalms, teachings, etc.
It also contains points, passages, comments that generate difficulties. However the difficulties are difficulties, at most, for the particular points. They don’t create difficulties for other parts of the Bible.
I would not say that my belief in Jesus/God is based on the Bible. But I wouldn’t say that my belief in Abraham Lincoln is based on the Encyclopedia Britannica either. With respect to Lincoln, it might be closer to a true picture of things to say that I believe that the Britannica is a source because I know things about the environment (both contemporary and historical) in which it exists/has existed, how it has been produced, etc., (and, of course I know these things because of what I have learned from other sources of information). My knowledge of these things is underlies the fact that I view the Britannica one way and works of fiction another (including fairy tales). If pressed to check the Bible literature against the “facts themselves” (it often seems like something like this is hurled as a challenge at believers, I can’t carry out such a check. But I can’t do this for any history book, and I take this to be a reductio ad absurdem of the challenge.)
One often hears that religious belief, unlike non-religious history, for example, is based on faith, not evidence. Using the above comparison between belief about Jesus Christ and belief about Abe Lincoln, where exactly does faith play a role in one, but not in the other?.
Ima T. Heist