What we don't posit, because we can't immediately see you, is 'well the letters must have magically appeared'.
O.
So because we can't see God do we have to assume that all the beneficial mutations occured by chance? Or do we see compelling evidence of the hand of God in the amazing complexity of life on this earth?
Because we can't see any evidence of God, nor does the concept make any sense, nor is there a clear consensus on what 'god' is, nor do we see any evidence for any of the corollary concepts (souls, spirits, angels, afterlife), nor do we see any evidence for specific claims of the innumerable cosmologies that spring up around these ideas of deities.
By contrast, naturalistic thinking which ignores supernatural concepts has been inordinately and consistently successful in discovering more and more about how and why phenomena that we experience and encounter occur.
On the track record available, I'll stick with the science.
O.