Well, hang on to your hat. There's more possibilities than just HIS existence or not.
You already consider that he might be Jehovah or Jesus or Allah or something that
Christianity doesn't support.
I lean toward disbelief in Him/Her/It. But there is the possibility that there is some
intelligence out there, and he started us off, but is disinterested in what we do now.
Or he is not disinterested, but doesn't interfere, or doesn't want us wasting so much
energy worshipping him.
In field service, years back, I encountered a grown-up hippy. He became an amateur
philosopher. He said, "If this Jehovah is out there, do you think he wants you to spend
every day selling those magazines and bowing to him? He created you to love and
enjoy life. Acknowledge that and start living that life for yourself. Doesn't he want you to enjoy
life?" The guy was right. I extend it further to say, "If he doesn't make his will clear
for us, is it possible that he doesn't have one? Isn't he forgiving and understanding
enough to allow us to live a decent life, without being religious, and then not holding
that against us since he didn't clearly spell out a lifecourse for us?"