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That's a very naive statement, since the theologies of the evangelical and liturgical churches have absolutely nothing in common (except a vocabulary that means something completely different to each group). Their doctrines are completely contradictory to each other. They can't all be true <<
The same can be said for any of the major world religions.
Put an ultra-orthodox Hasidic Jewish rabbi from Israel in the same room with a female lesbian reform Jewish rabbi from New York City and let me know how much common ground they can find theologically, though both will be seen as "Jewish Rabbis" to the general public.
Get a follower of Tolu-e-Islam (which rejects all hadiths) in the same room with the Ayatollah of Iran and see much common ground they can agree on. Bring in some radical black activist from the "Nation of Islam" (he will undoubtedly self-identify as a "Muslim" in public) in good measure and see how much he can agree with the other two.
Have a devout follower of Lingayatism Hinudism (they are an extremist monotheistic Shiva sect that believes Shiva alone is the one true God) meet up with a Hare Krishna (International Society for Krishna Consciousness) from California. See if they agree on anything. Both will claim to be Hindus.
As I was walking across a bridge one day; I saw a man standing outside the railing, about to jump off.
So I ran over and said, "Stop! Don't do it!"
"Why shouldn't I?" he said.
I said, "Well, there's so much to live for!"
He said, "Like what?"
I said, "Well...are you religious or atheist?"
He said, "Religious."
I said, "Me too! Are you Christian or Buddhist?"
He said, "Christian."
I said, "Me too! Are you Catholic or Protestant?"
He said, "Protestant."
I said, "Me too! Are you Episcopalian or Baptist?"
He said, "Baptist!"
I said,"Wow! Me too! Are you Baptist Church of GOD or Baptist Church of the Lord?"
He said, "Baptist Church of GOD!"
I said, "Me too! Are you Original Baptist Church of GOD, or are you Reformed Baptist Church of GOD?"
He said,"Reformed Baptist Church of GOD!"
I said, "Me too! Are you Reformed Baptist Church of GOD, reformation of 1879, or Reformed Baptist Church of GOD, reformation of 1915?"
He said, "Reformed Baptist Church of GOD, reformation of 1915!"
I said, "Die, heretic scum", and pushed him off.
-- Emo Phillips