-Prophet Muhammad s.a.w.w. could have received revelation but it could be satanic as well???
Satan would never warn us about himself,and satan would never ever tell us how to seek refuge from him...satan would never curse himself....
-the claims of epilepsy:
there are no reports of grand mal epilepsy (whereby the whole body is effected and it is so obvious that it could not be missed by anyone).
the minor forms of epilepsy are also ruled out because just sweating or trembling do NOT fulfil the criteria of epilepsy.
The detailed article is here.
https://rebuttaltounderstandingmuhammad.wordpress.com/2014/09/30/refuting-hallucinations-and-seizures/