Say someone told you they have had a best friend for over 40 years. If you asked them if they have ever met this person personally, they said only through the letters they sent them. They told you that person promised to come to them soon.
You would be very skeptical, and doubt that this person really existed. This is a perfect analogy of the Bible God. Friendships are established by physical contact. Anybody can write a book and slap the word Holy on it, but critical thinking can see through the masks of religion.
The Bible is the biggest scam trick in the history of the World. It is not wisdom to base your whole life on someone you have never seen physically.