Back to basics for a minute cos i've been busy all day and my head hurts.
When you turn the key, does the engine sound normal? apart from the obvious non start.
The fact that the cams are turning proves nothing except they are actually turning. If the belt has shredded or jumped for any reason, (usually left too long between renewals or badly fitted) then the engine could be miles out of time, hence the "normal" question.
Good point as usual Mr Pid, our resident short engine expert