Read the rest of the Bible and go back to scratching your head. Even the catholic encyclopaedia and their foremost scholars concede that there is no shred of biblical evidence, when you take the whole Bible, not just a single verse, to support the trinity doctrine.

You can, however find what your looking for in the religions of famous biblical bad-guys, like Egyptian, Babylonian, Assyrian, Greek and Roman cults! Loads of triune Gods there!