It does technically mean he was less influential, but only* because of the amount of time that has lapsed between the two people's lifetimes. What I am saying is that I don't think saying "A was more influential, because he has been influencing people for much longer than B" is very helpful, because that relies entirely on time, no influence. It's also not useful to say "without A, B never could have been as influential, because then you get the Dragutin Dimitrijević I mention above.
Actually, I think the best way to compare any two people is to compare what they did within their lifetimes. One can argue that Christ hasn't really been influencing people for 2,000 years, his followers have. His acts had enormous implications, but only because his followers achieved things after he died. Adolf Hitler took many more momentous decisions during his lifetime which directly affected people than Jesus Christ did.