Revised … simpler answer… Conquering death for all mankind? Taking on all men’s sins, is a tall order for me or you lol. He did battle with his most powerful adversary, who he created, we individuals are helpless against Satan, but with Christ nothing can touch us
Ps Jehovah witness say similar, they think Jesus isn’t god but archangel Michael, but two angels pitted against each other wouldnt lead to victory because god is the creator he alone has power to give life and overcome sin the wages being death.
We can of course pray to archangel Michael for help with everyday spiritual battles, but only through the power of Jesus is this possible.