My understanding of that "all of the ritual, none of the guilt" phrase ~ which is, of course, an oversimplification ~ does not imply any lack of essential substance (as per "tofu turkey").

My thinking is more along these lines: why attach oneself to an institution that insists that certain choices one makes with a completely clear conscience (such as voting for a politically-progressive candidate) are "guilty"? I have no desire to maintain membership in an institution that condemns me for doing what I think is right!

Does it not make more sense to participate in a spritiual community whose members share one's own values, or at least where one's views are acceptable as part of an inclusive spectrum?

And then, if the liturgy is strongly reminiscent of what's been familar since childhood, so much the better...