no comparison.
Islam is a false religion and a political/national ideology which does not trace its beginning to Jesus, nor does it even recognize Him as God.
It is just more heresy, albeit a vicious one, but heresies have abounded from the beginning and as is evident in this thread, heresies are still around.
The main difference in Islamists and other heretics, is that the Islamists have power which they wield to control their members.
You mean that length of time doesnt necessarily mean anything after all? Are you saying there are other criteria to take into consideration? Maybe like sticking with what scripture teaches and not listening to the tales of men?