I know Catholics are supposed to be obsessed with sex, but this post is not about that. It’s about sects or sectarianism.
A sect is a breakaway group–a split from the universal church, and put simply, it’s a sin.
The Church does not blame those who are born into a sect because they do not know better, but to have known the Catholic faith and split yourself away from the unity of the church is a grave sin. Dante, in his usual graphic manner portrays schismatics as themselves split down the middle.