that would be foolish, and i don't think (hope) they do. trinity consists of

- god (the one and only, the almighty, creator of the world etc)
- his son (cruified to take away our sins)
- and the holy spirit (probably the most difficult and interesting concept, some kind of bond, acting, guidance, will, hope, love, belief, something that can be (m)anything(s) and manifest in (m)anything(s), it would be interesting to draw a line back to nature religions in terms of "spirits" and "spirit beliefs")

jesus says numerous times that he's not god, but his son. why would a christian argue against the bible? (ok, i do sometimes, but europeans protestants are special in terms like these, especially when they were born in a formerly socialist country, compared to the american "fundamentalists" and catholics). the spirit is something that comes down on earth after the ascension of the christ, as a "visible" sign of god's love, so it's "only" a sign/metaphor (as there is no "ghost" in hollywood-terms, more like a "feeling" and a "moral guide").

at least that's how i see it. feel free to correct me.