Matthew 24:40 and 41...
Christ seems to be referring to the destruction of Jerusalem in AD 70, as he warned this generation will not pass away till all these things take place. Also, notice the people taken away in Noahs time were the unrighteous, not the righteous, which is the opposite of rapture theory.
In Matthew 24:13 Christ promises
the one who endures to the end will be saved. This includes Christians who will endure the Tribulation.