There are only a couple of dieties described as spaceless, timeless, immaterial and all powerful. There are a lot of mythical and man made gods but there aren't thousands of ones who could be The One. Your own intelligence is immaterial, so do you not believe in your own intelligence? You cannot touch it or taste it and yet, you have it.
There is plenty of evidence outside of the Bible. The NT alone cites more thn 30 people confirmed by secular sources or archaeology. There are 10 ancient non Christian sources including: Historians: Josephus, Tacitus, Suetonius, Thallus, Phlegon -Government Officials: Pliny the Younger, Emperor Trajan, Emperor Hadrian -Other Sources including The Jewish Talmud and Greek writer Lucian. When one combines what they all wrote, none contrdicts the NT.
Jesus proved His divinity and it was puntuated with His resurrection. Men did follow him around for 3 years - night and day and it was said that even His enemies couldn't find a lie in Him. Neither you or I could live under such scrutinity and have someone say this about us. There is an embarassment of riches when it comes to evidence of the Bible. BTW, 40 different author wrote it so that also takes away your "circular reasoning" claim. The book of Acts has 84 actual archaelogically confirmed details right down to the depth of the waters. I'll leave you with this:“I began with a mind unfavorable to it [Acts]….;but more recently I found myself brought into contact with the book of Acts as an authority for the topography, antiquities, and society of Asia Minor. It was gradually borne in upon me that in various details the narrative showed marvelous truth.”
(Archaeologist William Ramsey, St. Paul the Traveler and Roman Citizen, p. 8)