Because of the way the questions were framed, the repetition of key phrases, the manipulation, everything was sales based - ex was a salesman as well as a narcissist and I recognised every technique, including the attempts at a close.
It was an evangelical church that had taken over the local Mum and Baby Group, Youth Club and eventually the entire community centre as a whole whilst their members started going into local Conservative politics, which might have some bearing upon it, though. I heard two of them whispering 'how's your lovebombing going? Getting there' about the people they were 'buddying' when they thought nobody could hear them.
I went in there out of interest, but almost as soon as the first video started, never mind the conversation afterwards, my internal warning system pinged. From living with the ex and having studied RE to undergraduate level (so I knew a lot more than I let on), I was able to be non committal and not stand out as being 'difficult', so I heard much more over later weeks, including discussions about casting out people who didn't believe enough, how hard it was to resist the exhortations to tithe when they really couldn't afford it, how some of the wives were acting as an enforcement team, that kind of stuff. And how quickly people were dropped if they said they weren't comfortable.
I have no issue with Christians as a whole - Catholic, Protestant, whatever, they believe something that makes them happy. Just as Buddhists do, etc. But the Alpha Course felt completely different, very manipulative and, as I said, like high pressure sales. It might have been specific to that one evangelical church, but it set off enough red flags for me to want to avoid it forever.
But go to a CE, Baptist or RC church service? No problem. Help with the teas, set up and run the sound, fix the organ PA? No problem. Sing a Requiem Mass or at a show fundraising to repair the Lady Chapel? No problem. Ensure that others behave appropriately in a place of worship as part of my job? No problem.
Attend Alpha ever again? No chance.