I am an agnostic, although ND will roast me alive for saying that lol.
I can't prove there is no higher power and I don't think that there definitely is no higher power. I'm just willing to admit that I don't have all the answers in life and I don't resort to believing things for comfort. I WISH I could just believe in a higher power and get an everlasting wonderful afterlife - that would be great. But wishing it doesn't make it so. It's pretty sad to me that death may be nothingness, but I would definitely prefer that over the psychotic concept of hell. No loving deity would send its own creation to hell, especially when they didn't do anything wrong. The idea of sending an aborigine to hell who didn't even hear of Christianity is reprehensible and outright disgusting. That means a Christian living in the USA will go to heaven and the aborigine will go to hell just by luck of the draw. This is simply disgusting.
I think the Christian god is a despicable creation by man - I'm disgusted by that concept just as much as I am disgusted by other fictional characters - like Hannibal Lecter from Silence of the Lambs for example. A truly loving god would not send his own creation to hell knowing in advance they were going there - why was I created then?
I don't think most Christians will ever "get" the concept of omnipotence. If they did, they would never be able to reconcile all of the attributes of their god without severe cognitive dissonance.
Believe it or not, I am largely in agreement with your above points regarding many traditional Christian beliefs. I find the idea of an angry God (who dooms millions of souls to eternal hell for no other crime other than not even being aware of His existence) to be quite frightening at first thought and very hard to swallow upon second thought.
Virtually all of my family and many of my friends throughout my life have been Christian to a certain degree, although most not anywhere near "extremist" types. But things like what you mention regarding some of the apparent irrationality of traditional Christianity turned me off to organized religion at an early age.
But I suppose my willingness to accept that there may be or is some sort of higher power comes not only from my upbringing and friendships throughout my life, but also from what seems to be the uncanny knack I have for having incredibly good luck (being "blessed", if you will) regarding things beyond my control.
I spent many years in my teens and early adult years living a very "crazy", self destructive lifestyle, yet managed to walk away virtually unscathed, whereas many of my friends wound up with drinking problems, DUI's (and sometimes other criminal offenses), failed marriages, unwanted children, etc.
I've also made some bad career / business decisions, taken some incredible (often unwise) risks, and thought I was heading for bankruptcy / financial ruin on more than one occasion, yet things always seemed to fall into place at zero hour - often seemingly "magically". I don't know how to explain it other than to say I almost feel as though the old cliche of "someone looking out for me" applies here. Or maybe I'm just very lucky - I've lost track long ago of the number of times I should have died...