The philosophy that refuses to believe or accept any premise which is not supported by some sort of evidence, and which therefore maintains that all metaphysical and supernatural phenomena (deism) as well as all theologies and other religious doctrines (theism) are plainly superstitious and, in reality, subject to more sophisticated explanations, or even partly or wholly invalid.
According to adeists (who are essentially empiricists when it comes to the supernatural and the religious) anything can be dismissed which cannot be proven; to quote Christopher Hitchens, ‘That which can be asserted without evidence, can be dismissed without evidence.’
“You may wish to be a deist as my heroes Thomas Jefferson and Thomas Payne were, and you may not wish to abandon the idea that there must be some sort of first or proximate cause, or prime mover of the known and observable world and universe; but even if you can get yourself to that position – which we unbelievers maintain is always subject to better and more perfect and more elegant explanations – even if you can get yourself to that position: all your work is still ahead of you to go from being a deist to a theist. In other words, to someone who says god cares about you, knows who you are, minds what you do, answers your prayers, cares which bits of your penis or clitoris you sew away or have sewn away for you, minds who you go to bed with and in what way, minds what holy days you observe, minds what you eat, minds what positions you use for pleasure: all your work is still ahead of you and lots of luck, because there is nobody, there’s nobody – even Aquinas had to give it up – there’s no one who can move from the first position to the second.”
― Christopher Hitchens