I got this one.

Religion is a substitute for Reality. In order to create a religious mind, the group must convince an individual to believe the nonsensical, such as 3 = 1, or nuclear war on earth 10 billion years ago.

It's essential that it cannot be rationally understood or investigated. It's not enough to make unobservable assumptions, it has to be mock-worthy nonsense. Once an individual adopts such a belief, they're in the group. It's their membership card.

Having accepted absurdity as fact, they no longer have a healthy filter for belief in Reality. More nonsensical ideas can be jammed in the hole that's been torn in their cognition, and more importantly, false ideas. "Authority said so" has become enough to convince them - provided they trust the authority.

The doctrine of the trinity is for destroying healthy cognition and breaking human minds in order to plow their memes. It can't be made sense of, because it was never meant to. Just the opposite. It was made to free Christian leaders from the need to make sense.