Personally, I would go for a funky Chinese lad by the name of Ts'ai Lun and another funky European lad that would sound more familiar, Guttenburg. Reason? Simple, it is out of the pure fact that without Ts'ai Lun - widely acknowledged throughout the historian's world as the first person to dabble with paper, paper as we know it today - we would not be living in such a world as today. It is true that paper plays only a miniscule role in most people's lives, with seemingly little insignifance, because it was taken for granted! In all honesty, I sincerely doubt anyone would even give a beer-bottlecap about paper and its origins. It is just sheets of white handy stuff for us to jot notes down on, write love letters and make paper airplanes out of right?
What do you think life was like before paper was around? Papyrus was hard to come by if you didn't had an entire estate of it, plus it was inconvenient. Bamboo - as the Chiense used - was waaay to heavy, and it was also inconvenient; it also burnt very easily. The Europeans - technologically the backwater of human civilisation - relied on parchment, which deterioated far too quickly.
And Guttenburg? Without him, I'm willing to make the brave assumption that we would not have the mass media today. The printing thing - can't remember the technical term of the top of my head - that he had "created" has not only influenced the lives of millions during his time and the centuries after, it is now influencing the billions of lives even today. For, without Guttenburg, all forms of newsletters and the like would be handwritten! Imagine, getting The Daily Mirror and seeing someone else's messy scrawls and pen smudges here and there. Talk about a lasting impact. ;)
In my opinion - and again, like most of my opinions, it is personal - these lads played a FAR greater role than any of the religious figures put together in different combinations or all together. Sure, it's great to have your churches and synagogues and temples and mosques to go to, but I somehow prefer reading the news and writing on paper instead of doing the former. Maybe I'm such a staunch atheist?