 What is more sinful or scandalous, entering an invalid marriage or lying during pre-cana and on the altar to have the wedding follow canonical form? Well, let's break that down. Obviously, no, you shouldn't lie during pre-cana. Lie about what specifically? That you intend to have children? That's not good. Of course they're not good. So I would say they're equally, and for different reasons, objectionable.