There are some arguments put forth by the theists that god exists. See e.g. here Let's assume that god exists, now HOW do you know that "that god" is YOUR god. Specifically, how can you show that the bible authors have special privileges to access god and the words as recorded in the bible is a fair and true description of god.
On the contrary, if the bible is truly a faithful record of god, then it should contain no error, no ambiguity, no falsehood and immense insight which human-kind will find enlightening and amazed. The sad fact is that the bible is littered with error, falsehood and nothing is enlightening or amazing. The bible is more a compilation of deluded men trying to stitch together a story which may sound reasonable. The historical background of the bible writers (that a special class of parasites on the Jews people) and their inter fighting to amass power and influence is everywhere. The current version is a poor attempt of stitching together several contradicting versions in an attempt to please the majority. The tactics depended on the illiteracy of the common people at the time. Common people could not read the book nor remembered every details of the book. So contradiction in plain sight could be ignored.
For any person to have a mental capability to think and to believe in the incoherent stories, this is an illustration of the failure of current education system.