One religion that is spreading quickly is Islam. Islam is a religion believed by Muslims.
If we take time as a measure of the spread of religion,then since its establishment ,Islam is the religion which spread or still spreading rapidly in Asia followed by Christianity.
I Don't believe it is rapidly spreading today. 2000 years ago most people were dirt poor, religion is a way out, so to speak. "Your life is crap now, but believe in my imaginary god and after you die your 'life' will be all milk and honey"
The Christian Religion is spreading the fastest
any infectious disease rapidly spreading in a population.
cellulitis
It is used to say that something has spread rapidly, and is popular. I suppose the idea is that it is spreading like a virus - widely and rapidly.
The Apostle Paul.
It started spreading at the time of Christ and it is still spreading to this day.
Jesus Christ and the Bible and Spreading the message
severe persecution
other religions began to form such as Christianity
severe persecution