I’m beginning to think you are mistaking an “I don’t know” for an “I don’t know but it can’t be x”.
You wish. When I say I don't know, I mean I don't know.
There are probably several atheists who do not believe in infinite regression, Are highly sympathetic with necessary entities, unitary entities, fundamental entities, ultimate entities, etc indeed the literature seems to contain the suggestion that the Christian God could not possibly be the necessary entity demonstrating at least an understanding of the terms which is superior to your own
You don't seem to have noticed that part of what I've been saying is that, even if we accept some base of hierarchies idea, it becomes comical when you try to relate it to the Christian god.
I agree that an infinite regress of reasons seems rather unlikely, and that the obvious conclusion is that there is something genuinely fundamental. The problem arises when we ask why that exists, because the idea of something that couldn't fail to exist appears to be incoherent. I've read a number of versions of the argument, and spoken to other proponents of it on other forums, and none of them seem to be able to make it make any sort of logical sense.
It all basically seems to be "but, but... I don't like brute facts, and I can't think of anything else, so it
must be".
The problem remains that
nothing seems very satisfactory as an explanation for existence itself.
Every proposed explanation seems flawed in one way or another, which is why I don't know.
"
I think it's much more interesting to live not knowing than to have answers which might be wrong. I have approximate answers, and possible beliefs, and different degrees of uncertainty about different things, but I am not absolutely sure of anything. There are many things I don't know anything about, such as whether it means anything to ask "Why are we here?" I might think about it a little bit, and if I can't figure it out then I go on to something else. But I don't have to know an answer. I don't feel frightened by not knowing things, by being lost in the mysterious universe without having any purpose - which is the way it really is, as far as I can tell."
-- Richard Feynman, The Pleasure of Finding Things Out (1999)