Christianity could never have spread so quickly in the first century given the impact he had made during his short life here on earth.
Couldnt the same thing be said about Mohammed ? the founder of Islam ? hasnt his sayings spread so quickly in his short life so that his followers, if not equal christianity in numbers may even surpass them ? They both are well over 1 Billion followers world wide .
And Mohammed came about 6 Centuries after Jesus Christ ,what does that tell you.