Where does the Bible tell us that Protestants can have an invisible unity when Jesus expected a visible unity to be seen by the world (see John 17)?

Love is invisible, therefore the unity Christ referred to is invisible, precisely what is seen among Bible Christian:

John 13:35 By this shall all men know that ye are my disciples, if ye have love one to another.

Even though they belong to different denominations....they love each other, and embrace each other's Christianity...

The same cannot be said of Catholics belonging to the 242 denominations listed in the World Christian Encyclopedia. If Rome had the secular power it wielded in the days of the inquisition, they all would be slaughtered without mercy, as is evident by their banning from catholic sites, and the hateful bile Roman Catholics heap upon them.

I am convinced they are banned from Catholic apologetic sites, not because their arguments are particularly convincing, but because they bring out the worst in Catholic apologists...the horrible treatment they receive is embarrassing to thinking individuals.

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The times of this ignorance God winked at; but now commandeth all men every where to repent:

Behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me.-kjv