...except that, unlike Judaism, the belief systems of Atheism and Agnosticism do not have any collectivist ideals built into them.
Basically, what I am getting is that you have conceded that Judaism does in fact have some collectivist ideals built right in, with the only exception to that fact being that one is free to simply stop believing in Judaism. (At which point you are no longer Jewish, so... guess what, Judaism still has socialist principles built into it... as long as you are a believer... You personally discontinuing your personal belief does not change the faith as a whole, and as defined by the Torah)
That is not like Atheism or Agnosticism much at all. It is of course, similar to the Christian concept of tithing... and one can stop being Christian just as easily, and stop putting money into the collection plate.
Regardless of the fact that Judaism doesn't threaten it's followers with hellfire and damnation, there are certainly other systems of pressure within the Jewish community. Your claims to the contrary are just deceptive and frankly that is a load of crap. To suggest that it is not common in Jewish society to pressure family members to devoutly follow their faith, and to even date and marry only other Jewish people - is just ignoring a very common truth of the Jewish community. I'm a little surprised that you would act as though Orthodox Jews, and Hasidics simply don't exist...
It is not written anywhere in any sort of "non-believer doctrine" that you will be expected to give 10% of your income after taxes to the church, the poor, or anyone else. It is also certainly not expected that if you do not, that you will receive pressure from your peers until you do, or until you change your faith.
Also... since it needs to be addressed, even though it's not really the argument at hand... pressuring people into joining a faith, and pressuring people into giving up their property, are two separate issues. They are individual issues, and should not be linked or confused.