Mainly, yeah. If God exists I find myself unable to rationalize that he would be morally judgmental, or even be a "he" or other conscious entity at all. I also don't believe in any afterlife whatsoever. Once you get to that point of vagueness I just don't understand the purpose anymore.
This remind me of Chesterton's observation on the difference between mysticism and pure logic:
"Mysticism keeps men sane. As long as you have mystery you have health; when you destroy mystery you create morbidity. The ordinary man has always been sane because the ordinary man has always been a mystic. He has permitted the twilight. He has always had one foot in earth and the other in fairyland. He has always left himself free to doubt his gods; but (unlike the agnostic of to-day) free also to believe in them. He has always cared more for truth than for consistency. If he saw two truths that seemed to contradict each other, he would take the two truths and the contradiction along with them. His spiritual sight is stereoscopic, like his physical sight: he sees two different pictures at once and yet sees all the better for that. Thus he has always believed that there was such a thing as fate, but such a thing as free will also. Thus he believed that children were indeed the kingdom of heaven, but nevertheless ought to be obedient to the kingdom of earth. He admired youth because it was young and age because it was not. It is exactly this balance of apparent contradictions that has been the whole buoyancy of the healthy man.
The whole secret of mysticism is this: that man can understand everything by the help of what he does not understand. The morbid logician seeks to make everything lucid, and succeeds in making everything mysterious. The mystic allows one thing to be mysterious, and everything else becomes lucid. The determinist makes the theory of causation quite clear, and then finds that he cannot say "if you please" to the housemaid. The Christian permits free will to remain a sacred mystery; but because of this his relations with the housemaid become of a sparkling and crystal clearness. He puts the seed of dogma in a central darkness; but it branches forth in all directions with abounding natural health."
Orthodoxy by Gilbert K. Chesterton, Chapter 2
You're insisting that God make sense rationally, without taking into account that reason has its limits - especially when dealing with entities like God. Now that doesn't mean reason can aid one in understanding God better(or attributes of God, if not his full essence) - as St. Thomas Aquinas demonstrated with his 5 proofs. But ultimately the issue of knowledge of God(at least in the Abrahamic sense) lies in revelation.
Even Kant I believe dealt deeply with the issues of the limitation of reason, especially when dealing with issues related to God and its nature in
Critique of Pure Reason.
As for the metaphysical foundation...obviously it's a choice made outside of any sort of reason, but how is it that you decide to follow this particular uncertain truth and not a million other possible but uncertain truths? Why Christianity and not Islam or Hinduism or any other traditions?
Well there are plenty of reasons to pick Christianity over other religions, some are primary and others are secondary. A good secondary reason in my case would involve my cultural heritage for example - although it does point to an important secondary reason when comparing it to Islam for example.
But a good primary reason I could thing of is simply that Christianity makes more sense than the other religions when viewed from a comprehensive viewpoint. For example, Christianity has one god while Hinduism has several gods(thousands even I believe). Well Ockham's razor: One god makes more sense than thousands.
Concerning Islam; the common perspective on God's interaction with the natural world is that of Occasionalism - ie whatever happens is simply the will of God. Contrary to what many claim, Christianity has never adhered to such - but rather that God of course is the primary mover(or the unmoved mover) and through secondary agents interacts with the world. Of course sometimes God does directly intervene in the natural world, and these are called miracles. But miracles by their very nature are unusual events; and certainly cannot be taken as explaination for the normal course of natural events. For more info:
CATHOLIC ENCYCLOPEDIA: Miracle
I have discussed plenty of times here about the major impact such a perspective and other Christian theological concepts had upon the development of science as we know it; including the concept of methodical naturalism(which too often is mistaken for metaphysical naturalism by religion critics). Furthermore, many of the basic presuppositions of Modernity itself(on which much of atheism as we know it today grounds itself) are founded upon theological concepts derived in wake of the rise of Nominalism and the crisis it provoked within Medieval thinking. So the irony is that without Christianity, atheism as we know it could not even exist.
Now does this definatively prove Christianity is the one true faith? No it doesn't. That's an ultimately an issue of faith. But if you look at Christian perspectives as a whole and the wide-reaching impact they've had on the world(even when compared to that of other faiths); it can certainly point one to that conclusion.
I've barely scratched the surface of this issue with a few examples; but there's literally an over abundance of resources about Christianity's impact upon the world, not the mention entire treastises concerning debate with the claims of other religions.
For that matter, how is it that you've decided purely objective truth even exists at all?
I guess for now I can answer that since it's important for the cosmos to be governed by order, objective(or even more so
universal) is a must - otherwise you'd have chaos. Of course that's just one major piece in the much larger puzzle here. After all, one's view of ultimate things effects one's views on everything else. Even in a political context universal truth is important; for it is upon such that concepts of justice and even human rights are founded upon. Without universal truth(which comes from God), all you have is the mere arbitrary power of the state and might basically makes right. That's why Plato argued that atheism was so contrary to the political order; because it denies the ultimate foundation for morality, justice, and the order of being itself. So the issue of order and disorder does play an important role in the issue regarding objective/universal truth. But again I'm just barely scratching the surface here.