If all faiths are invalid, then they are all equally valid, literally. Personally, I think most of these "different" faiths and beliefs are just more glue that holds together the essential illusion by which we live: that there is seperateness between things, and as a result, we are separate from everything else.
In fact, I see so much reinforcement of this basic belief (one that does not bear out in any way experientially), that I start to wonder if there isn't some motive behind it.
The Rev