Charles Bukowski - American author

I'm about halfway through Ham on Rye (I'm a recent devotee, still have a quite a bit to plow through) and was caught off guard by the passage describing his childhood encounter with a demonic entity as a child, shortly after the full bloom of his acne vulgaris condition.

The scene takes place in his bedroom after he awakens from a nap. It caught me by surprise not only because it is very chilling (albeit brief) but because of his oft-stated disdain for religious or spiritual matters (however, I may be misinterpreting this profession of disdain, as I am by no means a Buk expert...yet.)

Anyway, does anyone care to offer conjecture on this passage?

Also, has he referenced this episode (if it was not meant to be allegorical) in any other writing?