Technically YHWH is Jewish.
From the vantage point of a Jew, YHWH's name is technically not "God." Rather he refers to himself as Yahweh "The lord, your god."
From the vantage point of a Christian, YHWH is not the god who refers to himself as "God" per se.
Naming the Judeo-Christian deity, "God," with a capital 'G' is a human error. I'm certain that YHWH wants no part in it.
This may be of some importance to you if you really believe in a creative intelligence correlating to Judeo-Christian (and Muslim) beliefs as you would also have to undoubtedly believe in all the other details that come along with said faiths, such as the existence of angels and demons. More importantly one should note that when demons are said to visit people they all too often want you to call them "God." It is upon accepting to refer to a demon as "God" or "god" that you then allow them to have possesion over you.
But hey, what do I know? I only study the nature and various doctrines of such religions. From my studies and inquiries I have become a Gnostic and I do not call out to my god as "God," because I find it to be vain and futile. If one is to dedicate their life to such a religion bearing some or all resemblence to Judeo-Christianity, one should learn the name of their deity before passing over to avoid any potential mix ups when they reach the after life.
Christian, Muslim, Hindu- it is all hocus pocus.
If one were to presume that the god, YHWH, is Jewish they would be correct in so much as he is the one who laid down the laws and creed governing what is commonly referred to as Judaism, thereby rendering himself as a Jew. It is the equivalent of the founding fathers of America laying down the law of America thereby rendering themselves as Americans rather than British, French, etcetera.
Let me finally reiterate, that there is no god named "God" in any faith when you look upon their foundations, except in the case of human error. The bibles, Qurans, Torah, etcetera that are published today are not the same books they were publishing yesterday- I would know, I was there, and so were many of you.
I blame such human errors, or deviations, on the current publishers and producers of Christianity, Islam and Judaism. Would it be wishful thinking to believe that at least some of you understand?