God, as our true Shepherd, provides total protection of His called out-ones forever. Being kept in God's name refers to assimilating the attributes of God.
The scope of the prophesied falling away is obviously international, affecting the entire world, involving a dramatic global rejection of even basic truth.
Paul gives two signs of the Tribulation: The falling away and the appearance of the man of sin who sits in the temple in Jerusalem (II Thessalonians 2:3-4).
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