[metmom]

Christ spoke in Aramaic, not Greek.

First, you need to prove that claim.

Second, the Holy Spirit inspired the writers of the NT to write it in Greek.

The Greek text settles the question of who the rock on which the church is built truly is.

[piusv]

I am not the best at explaining things, so I’ll leave this for those who are truly interested in knowing the Truth (perhaps those who are lurking):

http://www.catholic.com/blog/tim-staples/peter-the-rock