Yes, Dorothy, there are truths in all religions -- this is probably unavoidable about any belief system of enough complexity.  I would also assert that that coin has an obverse -- that there are falsehoods in all religions.

One can reach one of two (at least two) conclusions from this.  One might be that religion in general is a waste of time and worrying about religious truth and untruth are even more a waste of time.  The other might be that revealing truth is not a valid function of religion, but instead religion serves other human needs, probably deriving from our need to serve and worship and be comforted by whatever straw we can grasp -- derived ultimately by the natural selection of our evolution.