We require that all members believe
How indeed?
Manchester Green Party:

In other words, we of Manchester Green Party require that all members affirm a conspicuous and absurd lie. We regard refusal to do so as irrational hatred. We affirm that such refuseniks are not welcome as members of Manchester Green Party.
It’s Trumpian. Why does Manchester Green Party want to be Trumpian?

Good news for all the true believers who quit the Manchester branch of the Women’s Institute; they’ve got somewhere else to go to bully women.