@mazingerz88 Ah, I must apologise then, as I did not provide any qualification.
I believe religions are man made because they closely mirror the culture of the time in which they are written. Each time a non-religious advancement is made, within a few decades it is absorbed into the ideology of that religion. For example, over the last 40–50 years, homosexuality has gradually found acceptance in the wider community. Over the last 10 years or so, some Christian sects have been allowing homosexuals more responsibility in their churches. In 1859 when “On the Origin of the Species” was published, Christians were predominantly what we now call young-Earth creationists. As evolution grew in popularity, more Christians began to develop hypotheses such as theistic evolution and old-Earth creationism.
This isn’t limited to Christianity. When the Jews entered Caanan, according to the Bible, they began to take on aspects of idol worship. They saw the nations around them had pantheons rather than a single god, so they invented Asherah. In the past century or so, as religious respect and tolerance have grown, some hybrid religions have emerged such as the Ba’hai.
To my knowledge the only religion that has resisted adapting to social climate is Islam. That does not lend it any more credence though, because it was in itself formed from the pre-existing concepts of religion held by Jews and Christians. If a religion was not man-made, then it must contain features that no humans are capable of inventing. This is the proof some Islamic apologists use, since they do not think a human is capable of composing the literary beauty of the Qu’ran. While I cannot read Arabic, I would dispute that point considering the substantial portions that I have read in English. I would also contend that Allah is not a god worthy of the slightest respect, but that is for another day. I am not aware of any religion that bears a supernatural mark.