The idea seems to be that when the Bible says someone "falls" or "fell" it always means loss of salvation.
We see this is not the case and can mean a few different things:
1 John 2:19
They went out from us, but they were not of us; for if they had been of us, they would have remained with us; but they went out from us, in order that it might be made manifest that they all are not truly of us.
In this context, John is talking about the antichrists which were the gnostics plaguing the church at this time. They were professing Christians, they went through all the rituals and works, professed Christ, but were false believers. They went out from among us (the true christians) but its not that they LOST their eternal life, but rather that they were never of us(true christians) to begin with. They PROVED they were never genuinely regenerated by the fact that they left (or fell away.)
This is one way Scriptures CAN speak of someone leaving, falling away, without someone losing their eternal life (oxymoron terms there, but bare with me, im trying to reason with conditional security people)
These are the people who go to church every sunday, the tares among the wheat. Who are not truly converted, yet on the outside are professing Christians, go through all the rituals, do all the works, yet dont believe.
Lets say one of these guys tomorrow renounces Christ, becomes an atheist. This would be a guy who "FELL AWAY" from the faith. He was identified with teh faithful, no longer does, he knew the truth, he had the truth preached to him, he had tasted the truth, he had knowledge of it, but he supressed it in unrighteousness.
One thing is: Look at all the verses, I was accused of only reading half the Bible, but it seems you are doing that very thing! If you are stuck on "judas fell judas fell judas fell". Well okay, lets say you are right. Judas fell from the faith and lost his salvation. Well WHAT ABOUT the verses that says: God is the AUTHOR and FINISHER of our faith? DID GOD FAIL with Judas? See you got to look at the entire Bible, clearly Judas' faith WAS NOT authored and finished by God!