I'm Done, I've Had it!!!

Well, my son 100% lied to me and the entire administration present at the PPT.  He said that he had completed "30%" of his health project that was due.  How much did he actually do?  0%!!
His teacher & the team had mercifully given him until tomorrow to "finish" it.  He AGREED to finish it.  And he did nothing.  His so-called "logic" is that Health is not an important class, and that he's going to pass "anyway" even without the project, and that his teacher never should have given him the extension because the project was "already due".
What the heck???  What. the. heck??  And then he absolutely refused to do ANYTHING about it.  Anything!
What am I supposed to do?  I have done EVERYTHING to get this kid to comply.  I've spent thousands of dollars getting him the help that he needs, the teachers & admin are doing everything they can to work with him.  I've offered my help, including rearranging my work schedule to pick him up after school to get additional help, if needed.  But he himself has done NOTHING about his own education.  I'm tired of the lies.  I'm tired of him not even trying.
My husband was asking about the teacher's #, etc.  I said I usually email them (it really is the best way to get them).  He wants to let the teacher know to fail our son so he'll have to take the class again.  I told him that if he wants to tell the teacher that, do it himself.  (I'm tired of running interference for him.  He can deal with the school if he wants.  He doesn't need me holding his hand for him--he's an adult.)
I've prayed & cried out to God about it & all I get is nothing.  Silence.  I'm not even asking for me!  Does He not care?  Everyone says He does.  The Bible says ask in His name & you shall receive;  well, i've been asking, but not receiving.  Of course if I ever bring this up to anyone, all I get is qualifiers and "but but but." 
It's not that I don't believe in God.  I do.  But does He care about my nitty gritty details like everyone says He does?  It doesn't seem so.
All the fallout was at dinner tonight & I just yelled out that "I AM DONE!!!"  I had a good old fit in my room.  Really, I think adults need time out more than kids.  I sure did.
So there it all is.