February-Saturday
Devil Worshiper
Faith based reasoning has not harmed me. Unfortunately it may harm others.
Faith-based reasoning has long-reaching effects that might not be immediately noticeable. It's a drop of poison in your well of knowledge that can contaminate the whole pool, undercutting your reason on anything even tangentially related to whatever you have faith in and spreading through your mind like a disease.
Once that cognitive sleight is in there, it can be hard to shake free of and it damages everything it touches. In the wake of the ignorance and delusion faith causes, unintended harm is inevitable, although rarely apparent to the faithful.
It's not that complicated. Crippling your reason makes you unreasonable, and being unreasonable almost universally leads to tangible harm and loss.