I had a dalliance with an evangelical megachurch as a student and felt really overwhelmed by how peoples' whole identities were formed and bound to the church. The other students who joined basically exclusively dated one another and friendship groups were very tight knit within the church. The live band whilst good at playing would do the powerchords and drones and emotive tunes that would whip you into a frenzy of emotion and the paid teams would often be families. I realised it was not for me as it made me feel inadequate (i.e. if you didn't want to go on mission trips to Africa somehow they made me feel unholy, also no one wanted to date me and I was like the gooseberry to everyone else partnering up).
Very happy to have left religion behind. So yes first hand it *can* be very cult like in those types of churches. Usually the people are people with good hearts but you very much adopt a hive mind and socialize almost exclusively in those circles especially when they are megachurches. So I can totally understand how the Booths are all involved because that's typical for members of a family to all assume a role.
That said, I bloody love Grace, because her channel is not used as an evangelical medium. It's her, her brilliant ramblings, her shopping trips and quirks. Such a breath of fresh air and seems a genuinely nice person.