Theists have a low bar. Arguments that get over that bar are accepted as proof of God.
Atheists have a high bar. The "proofs" of God don't clear the bar.
Theists are awestruck by the complicated, and any time a atheist cannot provide an answer, the theist jumps in and says "it was God." To theists, the complicated way that human (or animal) bodies work is proof of God. If scientists can't understand why the expanding universe is accelerating the expansion, theists say that it is proof of God.
Thus, when Einstein (somewhat of an agnostic) made pages of arguments and calculations to establish the tiny and simple formula E=mc^2, he asserted that God made all science simple. When Schroedinger proposed Quantum Mechanics (the tiny world is governed by stochastic variables), Einstein quipped that "God doesn't play dice with the universe."
Are we going to call Einstein and Fermi idiots? If so, what chance do we have? Just look at who these theists are....we must respect theism.
I walked with my theist friend and stood on a rock pile with him. On the rock pile, he found a rock and asserted that it was proof of the existence of God (God put it there when he asked for a sign). Most would say that the "bar" was a bit low that day.
Other theists (like my aunt who had two stillborn babies then turned strongly toward religion to try to make sense of it and believe that the babies lived on in heaven) joined a Baptist church that spoke in tongues. Disbelievers thought that they were insane (hallucinating) and writhing on the floor babbling (they claimed to be talking in tongues and having a conversation with God). Is it Schizophrenia or proof of God? Certainly many had severe trauma in their lives....the kind that drive sane people crazy.
Who am I to say that one is right and one is wrong? I still must respect theism.
Some theists join cults, and some cults are dangerous.
Marshall Applewhite's Heaven's Gate cult took poison to die so their souls could fly in an alien spacecraft hidden behind the Hale-Bopp comet, pick them up and land them on the comet so they could tour the solar system for eternity. Atheists might argue that they were wrong.
Reverend Jim Jones made a cult that gave poisoned kool aid. They had plenty of practice tests with non-poisonous substances that they said were poison, just to get them all to disbelieve that it was poison. Star Trek's lieutenant Ohura had a brother die at Jonestown in the cult.
The higher "bar" of atheists prevents them from believing in Santa, the tooth fairy, cartoon characters like Fred Flintstone, et al. Without the requirement of proof, one must believe in absolutely everything.
Theists believe that many apostles vouched for the things that Jesus said. But, the bible was written more than a hundred years after the death of Jesus. That would mean that over a hundred years later, all of the apostles would have had to have assembled to help the author (a human divinely inspired) to write the bible. Unless, divine intervention allowed them to know what the apostles heard. Thus, to believe that the apostles correctly recorded their versions in the bible, must be a theist. But if one is using the bible to prove that there is a God, one must believe that there is a God and he guided the person to make the proof that there is a God (a circular argument).
Fear motivates religion. No one wants to burn in hell for eternity (if there is a hell), and many don't want to guess wrong.
Some religions believe in human sacrifices. If they intend to kill me, I'd likely object, because I don't believe as they do.
Some religions don't believe their own religions. For example, the Christian faith believes that God said "thou shalt not kill" yet, their Religious Right choices make war for profit (mammon). Revelation says that if you attack Iraq, you will face God's wrath. Apparently God was right and President W. Bush was wrong....Iraq wasn't behind terrorism.
Who would figure that God would be right?