A few thoughts -
Cyberschool does have homework - at least the one my son attended. He was very successful at it while he was in the program for troubled teens that we sent him to-- but the cyberschool there was during a structured period, with tutors available to monitor and help. When he tried it at home, he just couldn't focus...I don't think it's a good fit for kids with ADHD.
His comments about God are actually ENCOURAGING - as anger is the flip side of love. You can't hate someone you think is irrelevant- so if he hates God now, he's on the way to a spiritual experience.
If he has an IEP or Ed Plan, the school is legally required to provide a tutor while he is suspended-- in most states, anyway. Talk to his special ed team about having a tutor come to work with him while he's home (taking the pressure off you) and about dealing with the "pile" that's accumulating and increasing his stress.
Best of luck with this- detaching with love from a dependent child living in your home is pretty tough...