Cold Steel,
What Jews find repulsive is claiming that people require salvation. Humanity is neither condemned under some curse of sin nor requires a salvation of any sort. All people, including atheists, are inherently very good to begin with.
Jews also acknowledge that this life may be all there is. So we focus on that. If there is an eternity, it is not entered into by the Gentile religious trait of having to "believe" in doctrines or theological concepts.
Jews also teach that religion is not a requisite of all people. Being just is, but belonging to a certain religion or worshipping any particular God, even ours, is not.
The idea that people should be subject to proselytizing, being told they must change their current convictions or even some of their cultural traits or beliefs less they get less of a reward than others in eternity, that I find appalling. As long as my neighbor is just, they needn't be anything more than they already are.
And if there truly is a World to Come, then they surely have a place in it--not because they believe in anything in particular, but because they are inherently good to begin with.
Proselytizing, as you know, is considered an act of anti-Semitism by Jews when Mormons attempt it with us. And I personally view the act just as insulting of an action toward anyone else for it tells a person that they have change something or lose out for not doing so.