I hate shopping :)
Seriously, I find the whole exercise tiring. I think there was time when there was one Presbyterian Church, and it was pretty much the same wherever one went. Today I'm actually leery of entering one, because I have no idea what they believe.
No, there was never ‘just one’ Presbyterian Church. They have a rich history of splitting and re-uniting. Basically the major players today are the PCUSA - organizationally liberal to heretic, but with a few moderates left. Evangelical Presbyterian Church - Moderate (orhodox except for permitting, but not requiring the ordination of women). Presbyterian Church in America - conservative to moderate. Orthodox Presbyterian Church - conservative. Associate Reformed Presbyterian - conservative to moderate. Cumberland Presbyterians are liberal and theologically distinct in their beliefs.