Just so we're all clear, I have only read the first post here, and am answering the question.
I'd say the reason I'm not a Christian insofar that I don't accept Jesus as divine is mainly out of pride. Yeah, I know that's what got Lucifer kicked out, but I don't want to bow down in submission to anything or anybody, god or otherwise. I will bow in respect, just so we all are clear on that; if I ever met YHWH in person, I would bow out of respect for being in the presence of a god. But I wouldn't submit. I don't claim to be "higher" than the gods, however, nor do I want to be a god myself. I'm content as a human being, and I don't need any supernatural powers to make my life "better," as I know I would just be corrupted by the power. (So if the satan offered me eternal power in exchange for my soul, I'd decline for the same reason as above, that I will not bow in submission.)
In fact, I do not worship any god, even the celestial ones from whom I take lessons in spirituality. I consider them to be teachers, nothing more. I don't think it would be appropriate to say I don't "believe" in them, as I do believe in their existence. So YHWH does exist in my eyes, but I don't worship him. If the question, however, is also asking why I don't believe, meaning that I don't trust them to be telling the truth, is because the only supposed source of these "promises" is a millenia-year-old book that has seen more versions of the same English translation than Street Fighter 2, let alone the different versions that are found in various other languages. And how can we be sure that the Hebrew/Greek versions that you can find here and there are legitimate? Sure, they make grammatical sense by modern standards, but can we be absolutely sure that they also haven't been watered down by biased scholars and priests?
Now, if YHWH himself came to me in person, not in a dream, but physically, and it was obviously him, and he told me that [this] particular sect of Christianity was the true way, that's different. However, even though I would have renewed faith and could then be considered a Christian, I would not lose who I truly am: a pagan, and I would tell YHWH this. If it meant that I would burn forever in the lake of fire, so be it.