Hello, as I found on the internet, The oldest book related to the bible and written was 1 Thessalonians, written around 50 CE. Still, things can be very different, and we can't say for sure. I spoke with a priest from https://firstchurchlove.com, who told me that bible was composed of many different parts written in different ages and by different prophets. In general, it is important to believe in God and that something supernatural exists in this world. If you want to find out more, visit the firstchurchlove website.