I clipped your post so as to avoid forays into soul sleep theology, which is one of the errors in the list - I think it is
#53 Soul Sleep: Death is an unconscious, sleep-like state. When Jesus Christ comes again, He will resurrect the dead who believe in Him and will take them to heaven. The dead who are unbelievers will be resurrected 1000 years later.
Anyway, "let the dead bury their dead" doesn't help you with your claim that the dead are asleep (unconscious) in Christ.
"Let the dead bury their dead" wasn't meant to support the idea of a sleep like state when dead. It was meant to show how Jesus spoke figuratively. So you can't take "He is the God of the living" to mean that the dead are actually alive in heaven.
THe following verses however are definitiely meant to support the sleep like state. I think you may have missed them:
Gen 3:19 - In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou
art, and unto dust shalt thou return.
Deut 31:16 - And the LORD said unto Moses, Behold, thou shalt
sleep with thy fathers; and this people will rise up, and go a whoring after the gods of the strangers of the land, whither they go
to be among them, and will forsake me, and break my covenant which I have made with them
2 Samuel 7:12 - And when thy days be fulfilled, and thou shalt
sleep with thy fathers, I will set up thy seed after thee, which shall proceed out of thy bowels, and I will establish his kingdom
1 Kings 1:21 - Otherwise it shall come to pass, when my lord the king shall
sleep with his fathers, that I and my son Solomon shall be counted offenders.
MAtt 9:24 - He said unto them, Give place: for the maid is not dead, but
sleepeth. And they laughed him to scorn.
Ecc 9:5 - For the living know that they shall die: but the dead know not any thing, neither have they any more a reward; for the memory of them is forgotten