Gralian said:
Can Jews really only find partners through a "matchmaker"? That seems terribly... restricting.
No. Matchmakers were common in pretty much all cultures at one point. They are still make a good business in the Orthodox community, and while not orthodox, I almost got talked into using one myself.
Jewish matchmakers are no different than a good dating service. The look into what you are looking for in a partner, and try to match you up. At least one in person meeting is required before an engagment may be considered (and of course you can meet/talk as much as you like, just like any other way of being set up).
Two of my observant orthodox cousins used a matchmaker. One was such a shy guy he'd have probably never meet a girl otherwise, and the other frankly did so because her standards were so high she couldn't find someone who met them within the community. Both marriages have worked out wonderfully and they really were people that completed each other.
Edit: Also, what's the deal with circumcision? Is it meant to represent your submission to God?
No. We are told it is simply an outward token/reminder of our contract with God.
That wasn't the only reminder we were given, we were told in several ways to use tokens to remind us (and the history of the Jewish people shows we need reminders lol), that's just the only one in our flesh.