When we are one with the Father as Jesus was (which John 17 tells us that we are) when you see us, you see the Father. I discussed how further in this article: http://lothealing.com/coming-in-our-fathers-name-praying-in-jesuss-name/

Just because you have the "name" of something, doesn't mean you are something. We have the name of YHWH in Revelation, but it doesn't make us YHWH. And if you think that's referring to Jesus, then you have two everlasting Fathers. YHWH accomplished it by raising his son up as a messiah.

As for Zechariah, they pierced the son, not the Father. This video will help clear that mistranslation up.

As it is, it says they'll look on the one they pierced and mourn for someone else. You can easily tell there was a translation problem.

If you're interested in studying this out you can check out this website too: http://www.angelfire.com/space/thegospeltruth/trinity.html

I used to believe in the trinity until I found out how illogical it was and how many translation problems there were that led to people being confused about the issue. That website helped a lot.