What's your favorite Christian heresy?

[RINO Tom]

I have always found Arianism really interesting.  I do not subscribe to it at all, but it retains sort of a "mystical" aura about it given that it was so prominent in ancient times only to completely die out relatively quickly.

(Yes, I know certain modern "Christian" groups like Jehovah's Witnesses have a similar view of the Trinity, but they don't claim descent from Arians.)

[RINO Tom]

I have always found Arianism really interesting.  I do not subscribe to it at all, but it retains sort of a "mystical" aura about it given that it was so prominent in ancient times only to completely die out relatively quickly.

(Yes, I know certain modern "Christian" groups like Jehovah's Witnesses have a similar view of the Trinity, but they don't claim descent from Arians.)

Nestorianism is also fascinating in this respect given that most modern Protestants (especially American "low church" denominations) take approximately the same position on the role of Mary as the Church of the East.

Yeah, I am no theologian expert, but I do find it kind of ironic that many of the Evangelical online types who love talking about how the Mainline churches "aren't Christian anymore" often have some, err, quasi-heretical views, lol.

EDIT: I am also not endorsing talking shlt about more low church theology, either ... I believe there is plenty of room to interpret Christianity a lot of different ways on issues like this.  I just find it inherently strange for NEWER, less orthodox Christian groups to question the "Christianness" of those who predate them and from whom they descend.  I mean, I am a Lutheran and have many issues with the Catholic Church but I feel I must have a very baseline respect for them as legitimate given where we frickin' came from, lol...

[RINO Tom]

Sedevacantism does have legitimate grievances with Rome.

I don't mean this question as an attack or even a criticism really, but why exactly would a staunch Reformed Protestant like yourself understand internal Catholic Church issues well enough to hold this position, especially since a huge sede issue is perceived "Protestantization" of things like the liturgy and Biblical theology? There's way more to the rationale behind sedevacantism and the Traditionalist Catholic movement/subculture in general than just "Left-Leaning Pope Bad", even if "Left-Leaning Pope Bad" currently eats up a lot of many trads' intellectual and emotional energy.

IDK, I'm not Catholic, but I never quite understood this.  It's not like Pope Francis went out and officiated a gay marriage and then attended a pro-choice protest.  Does "left-leaning" just mean he takes climate change and economic injustice seriously?

If you read what Pope Francis has actually wrote and talked about, he upholds Christian standards on same sex marriage and abortion. What's he talking about however is a " pastoral " approach, that to some might come super close, to accepting those two things.

The second part, that part of the opposition to Pope Francis comes from American Catholics, who are backed by a lot of money because American Catholicism has always been influenced by The American Evangelical movement, which is more pro capitalist.

I will also add that American Mainline Protestantism - which more or less is the descendant of "Protestantism in the United States" before the mid-Twentieth Century, IMO - was also pretty clearly in favor of capitalism and always had a much more economically conservative outlook than Catholics.  From the "Protestant Work Ethic" mentality given to us by the Puritans/Congregationalists to the stereotype of the American WASP (who I feel like is usually an Episcopalian, Methodist or maybe Presbyterian) to even modern Mainliners' "liberal" attitudes on social justice almost never going beyond private charity in its economic message.  Protestantism in general, ever since Martin Luther, has taken a much more accepting view of private wealth creation through market forces than Catholicism, from what I have seen.