No. They are the elect.
{22} "Unless those days had been cut short, no life would have been saved;
but for the sake of the elect those days will be cut short. Matthew 24:22 (NASB)
Christ had already told His disciples earlier in this passage to flee Jerusalem when they saw the signs. They did. So who was left in Jerusalem? The elect: the 144,000 that had come to their last Passover and who were trapped in the city by the Romans.
Thus, He had gathered His elect from the four winds. These were not Christians: these were the remnant God chose to save from His wrath poured out on Jerusalem via the Romans.
There is an OT analog to this:
{3} Then the glory of the God of Israel went up from the cherub on which it had been, to the threshold of the temple. And He called to the man clothed in linen at whose loins was the writing case. {4} The LORD said to him, "Go through the midst of the city, even through the midst of Jerusalem, and put a mark on the foreheads of the men who sigh and groan over all the abominations which are being committed in its midst."
{5} But to the others He said in my hearing, "Go through the city after him and strike; do not let your eye have pity and do not spare. {6} "Utterly slay old men, young men, maidens, little children, and women, but do not touch any man on whom is the mark; and you shall start from My sanctuary." So they started with the elders who were before the temple. Ezekiel 9:3-6 (NASB)
The elect is the remnant of Israel spared throughout each and all of God's judgments on them.