@SpeedSnap, pointythings wasn't randomly haranguing you about abortions or your views on them, she was explaining to you that your belief about abortion being a rite for Satanists is based on a misunderstanding. She was trying to explain to you that:
- despite apparent efforts to establish a nation with freedom of religion, in some ways the US is set up to privilege religion, and those who can point to a faith-based justification for what they want to do
- some Americans who believe in both freedom of and freedom from religion, realised they could "play the game"
- they set up a "religion" of their own, saying that, for example, the freedoms they want are fundamental to that religion
- but this wasn't just a con trick to get around the rules — if they were just trying to cheat the system, they'd have gone for something discreet, but instead they deliberately chose a provocative, attention-grabbing name, one that might make those of the dominant Christian religion think twice about things like, say, whether it's really a good idea to have religion represented in officialdom like having religious symbols in public buildings.
To expand on that: if you're Christian living in a Christian-dominated but nominally secular (that is, not affiliated with or privileging any particular religion, rather than atheistic) country, you might think nothing of it if you went into a courtroom to be tried, and there was a cross on one wall and a plaque with the Ten Commandments on the other.
But if you were of another religion or of no religion, you might feel uncomfortable, marginalised, maybe concerned you weren't going to be treated fairly. (These symbols can also act as religious priming — that is, just having seen them can affect people's subsequent behaviour — including judges, jurors, witnesses etc.)
IIRC, US law says something along the lines of, if one religion is allowed to put a symbol somewhere in a public (i.e. taxpayer-funded, apparatus of state) building, then all religions should be treated equally. By choosing the name and symbols of Satanism, the group that I mentioned would be able to, firstly, make a point about how it feels to see religious beliefs you profoundly disagree displayed in a public building that should be for everyone equally, and secondly, use that as leverage to get religious symbols out of public buildings altogether.
pointy wasn't asking you to account for your beliefs on abortion; she was generously explaining to you that you were operating under a misconception. Although it's understandable that you believed what you said was true — it's something they say about themselves, after all — it's not actually true that they genuinely believe in abortion as a religious rite. They're not a satanic religious group with bloodthirsty rites, they're a political and civil liberties group who've felt they have to play the system to make a point about the system's flaws.