Knowing that demons are real
Whoa, whoa - not so fast. You seem to be leaping to the conclusion that your notion of demons is also mine.
and fallen from the grace of Yahovah and Yeheshuah,
Okay, I am not Jewish by culture nor practice and Joe Heavy is pretty explicit with Moses that his special arrangement is with them.
"Yeheshua", the Renaissance Pentagrammaton, was invented to piggy-back on that, to remain with the God of Abraham and even on Team Jesus while approaching Hebrew Kabbalah as a replacement for the ceremonial of the Catholic Church.
and that Shem angels may or may not be his loyal ones (Lucifer masquerades as one),
But even in Judaism, demons have a job to do, as a necessary part of Creation. In every shattered husk of the World of Shells remains a fragment of divine Light. Restoring that is part of the work, even in Theurgy.
why do you, knowing this, continue to follow demons?
No judgement call here, just curious.
But I am not Jewish, not Abrahamic, and have been told that certain immutable aspects of my being are not compatible with the rules of Team Jesus or Joe Heavy, and far be it from me to intrude myself where unwelcome.
I work by and with a different theology.
That includes a different notion of demons, or daemons (δαίμων, in Greek) - the old notion of subtle, longeval, spirit beings that dispense the powers of the Celestial Spheres among the Sub-Lunar world.
I offer reverence, or veneration, as I would to a divinity because they respond well to it. Same reason I evoke not with the Sword of force or threat, but the Cup of companionship and hospitality.
It's good manners.
As for following, I only do so in far as They know the way and I do not - which is seldom. Mostly we just converse.
Or, on another level of working, take Astaroth whom I regard as a deity - a manifestation, or cognate, or alter-ego or descendent of Ashtoreth of the scriptures, the Phoenician Astarte. The ancient goddess not only didn't exclude folks like me from participation, we received equal accommodation at her sanctuaries, as both supplicants and servitors.
You say Astaroth is a demon, okay. That doesn't alter my relationship with that power. I'm just going to go on with my thing, and if that iis demon-worship to you, that's a you thing. See?