Delusion may sound harsh at the personal level but if it quacks..

The word describes things perfectly in the same way as faith. If things religion dictates actually existed you would have no need for faith, hence the delusion is an important facet.

If delusion is insulting, how do you deal with asking for forgiveness for sinning or feeling not worthy being as a virtue? The bollocks that clergy deal out at the altar sometimes make delusion sound a little tame.