[CynicalBear]

>>No,the falling away is not a departure. it is a moral, spiritual corruption of the entire Earth.<<

It's not the falling away. A little study of the ancient Greek helps.

646 apostasía (from 868 /aphístēmi, "leave, depart," which is derived from 575 /apó, "away from" and 2476 /histémi, "stand") – properly, departure (implying desertion); apostasy – literally, "a leaving, from a previous standing." [http://biblehub.com/greek/646.htm]

The departure of the ekklesi happens before that "man of sin" can be revealed.

[editor-surveyor]

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No one “departs” before the Man of Sin is revealed.

You, make Paul a liar.

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