The obsessive drive to convert people was a critical survival trait early on, obviously.
Whic only goes to prove that humans are stupid. If conversion is so important, and god is so powerful, then it would have already happened. Claim free will all you like, God is supposed to have designed humanity, and if a whole mess of humans hear "the good word" and say "nope" then that is a flaw in the programming. It is like blaming nails for not being sharp enough after you bought the cheapest possible moulds for your nail factory...
If "the good word" was so important, then it would have been spread faster. Whole generations went by just waiting for it to reach them. Whole people's lives passed with no chance at salvation, not because the message wasn't out, but because god apparently has no understanding of or preparation for distribution. I mean, entire regions' worth of souls going to waste because god couldn't be bother to so much as get a few bible-bashers lost in a cave only to emerge on the far side of the world? Or washed ashore in a strange land? I mean, the world has all this ocean, it meant that a whole mess of people didn't have the slightest hope of being "saved" for the better-part of two millennia, there are people who still haven't had any meaningful contact with it. God supposedly designed the world, all that isolating ocean included, and couldn't be bothered to so much as lift a finger even though apparently it is really important to spread this message out everywhere. Didn't even send a dream to cross the ocean or anything. A bunch of heathen vikings could figure it out, but god? The lazy liar just doesn't care about souls so long as it has enough to fill its belly in time for tea-time...
For brevity:
The more important evangelism is to a religion, the more dependent it is upon that evangelism to be successful in order to demonstrate its own validity. If it reaches the point that membership is required for even the slightest measure of success, then it becomes necessary for everyone to have access to it in order to demonstrate that the subject of the religion actually cares about universal success. And given that "success" in this instance means avoiding an eternity of torment, or summary execution, at "god's" discretion, it is immediately obvious that the god in question is either feeble or malevolent, neither makes spending an eternity with the thing an attractive offer. At least an eternity of torment leaves me trapped with a self that I can tolerate.