Again we see the problem of misinterpretation, if you go out looking hard enough for evidence of anything you may eventually find something that points towards it... but this doesnt mean it proves it... it is jsut misinterpretation:
'baptizing them in the name of the Father, and of the Son, and of the Holy Ghost'
This is not saying the father the son and the holy ghost are one and the same being, rather what it is saying they are one in the same goal... and have to same objectives... the worship of allah. This quote DOES NOT provide any clear evidence for the existence of a trinity.
And again you take Matthew 15:8 out of context:
"This people draweth nigh unto me with their mouth, and honoureth me with [their] lips; but their heart is far from me."
Read up on this please! Your ABUNDANCE of spiritual MISunderstanding quite frankly appauls me, come back when you have a decent arguement to make, im not even christian anymore and even i know this verse is not concerning islam. This verse is talking about the pharisees and Esaias prophecy of them, read the chapter from the beginning. Just to make sure you do...
Matthew 15:1 - 'Then came to Jesus SCRIBES and PHARISEES, which were of Jerusalem, saying'
Im sure you can read the rest for yourself.