It is not becoming atheist¹ that makes you intelligent, it is intelligence that makes you an atheist.
It takes a good level of deliberate obstinacy to look through the Bible and Quran and say those are the words – inspired or revealed – of a perfectly good and just God.

To say categorically that there cannot be contradictions in the scripture and on that basis refuse to look at and/or see the obvious contradictions and holes in the theology, as well as holding as facts, such tales as Noah and the flood requires a certain level of obtuseness.

To say that contradictory accounts of a single event like the purported death and ressurection of jesus is because four observers can witness one event but all end up with differing recollections, while also maintaining that the scriptures were inspired by God is just "brilliant"

Given that this god is supposedly not the author of confusion, and the tales he has inspired do not even add up to four blind men observing an elephant², but four supposedly sighted/inspired men looking at one animal and seeing an elephant, a whale, a rat and an owl all at once.

The fact that a god (or more) deems it is sinful to shave, wear mixed fabric, eat pork, or consume alcohol, while outrightly sanctioning slavery among other things we consider wrong shows how good and just he is; and the "right thinking" nature of those who worship such.

¹ Atheism is in reality not the categorical stance that there can be no divinity outside our realm of existence. That would be a really dumb stance.
It is an understanding that all of the divinities proposed by all the various religions over time have no real backing for their...

...existence. That all gods, Gods and goddesses have no objective evidence to back them up and ought be rejected.

That Zeus, Thor, Allah, Yahweh and all the rest of them are in one boat.

If you are a Christian and believe the Greek pantheon false, you my friend are an atheist.

² That would have been laughable in itself. https://en.m.wikipedia.org/wiki/Blind_men_and_an_elephant