Before I became a believer, I used to give Christians a hard time with the “Oh, you believe in three gods” line... but I realized in the end, that it wasn’t that over-simplifiable.
“One God comprising three persons” is the official Christian theology. And this even ends up being respected in a different context by observant Jews, namely that of what gentiles can be validly viewed as non-polytheists and thus eligible to perform certain services for observant Jews. This concept of God is likened to that of a wheel with three spokes, which remains one wheel.
Literally and actually, at best (just to give you our party line,) within Orthodox Judaism, a minority opinion, that is to say, leniently-leaning Orthodox rabbis**, rule that a trinity is considered a “Partnership” and not separate entities. The prevailing opinion is that Christian theology has 3 separate gods (G-d forbid.) Thus an Orthodox Jew will not even enter a church.
**For a brief expose on rabbinical opinion, for the many, oh so many FReepers interested, and as an example, take the beard. There are Orthodox opinions that one must not remove his beard at all (generally a minority of Chassidic rabbis with the authority to make rulings within Jewish law,) a prevailing majority who agree that a beard can be removed but without a razoring of the face (ie, straight edge, Gillette, etc) ONLY with an electric shearing-type cut or a scissors. Ergo, you see different Jews with different customs. Take a light switch on the Sabbath, all agree that it is akin to “lighting a fire in your tents,” etc. And no Orthodox Jew, world-wide, would operate a light switch on Shabbos. The take-away is that G-d devised it that way so that we would adapt to any community where we would eventually be found. Many Jews, many diverse lands, many customs, all Orthodox, that is, following the Torah in its entirety as able (I say that less someone says, “But you can’t sacrifice anymore... Nu? Nu? Can’t keep the Law... Yes we do keep the Law and there are those who are perfectly righteous.)
I wrote about it before in a comment thread, that the Trinity is, (l’havdil,) obvious to Jews with even a basic understanding of Kabbala and Chassidic philosophy, a gross misunderstanding of how G-d manifests for Himself, as it were, while crating/sustaining our world, as it were, and as He exists within the world (nature, etc,) as it were. Clear as a bell. You would jump to say “But these are Father/son/spirit!!” But don’t jump into Jewish mysticism without a primer. It’s so essential. Look above where I wrote just a few Hebrew words. Scripture in the Holy Tongue. G-d “spoke” and created the world (G-d has a mouth??!) There are such exact and unfathomably-deep meanings behind every word and letter in Hebrew, that jumping to a KJV in English is absolutely ludicrous.
I know the (joking) many, many FReepers who aren’t really reading these threads won’t care, but perhaps you’d be interested in a couple of primers. One on Hebrew letters and their Divine energy, and one a series, at your leisure, on history of the Oral Law as explained with an understanding of Kabbala and Chassidic philosophies. (slightly above beginner and by a South African, if you can stand the accent.)
https://www.youtube.com/watch?v=fBy71RLx8xQ
and the history series:
(if you pastor, you will be able to derive oceans of sermons from this:)
http://www.chabad.org/multimedia/media_cdo/aid/680636/jewish/The-Kabbalah-of-Jewish-History.htm