Are you saying that people who derive ideas from the Bible are all swindlers? There is no good reason to suppose that, in the case of the Quran. Muhammad was exposed to the Judaism and Christianity already widespread in Arabia. His ides of what monotheism is, and on the attributes of God, were modelled on the Torah and the Testaments, for he had no other sources. It's possible that Muhammad was a charlatan, but more likely that he was really intellectually influenced by earlier religious teachings, as people have been both before and since his day.I have not seen much criticism of the Quran over past centuries. There is one book entitled ' the original sources of the Qur'an ' by William Tisdall.
I actually just got a copy of it in paperback, but I have read some of it before because it is available, free to read on the internet.
I am fully aware there is a direct correlation between the Quran and the bible.
It is my argument that Muhammad stole most of his material from the bible because it occurred to him he could scare people into following him by pretending to get a message from God.
The bible is obviously full of trash, but I am not bothered about that and I do not intend to study the bible to find flaws in it because it has been done by experts.
Real charlatan religions do exist. Mormonism and Scientology are examples. Islam doesn't look quite as phoney or contrived as these later outfits.