Revelation chapter 13, speaks of religious persecution and intolerance will be everywhere because Babylon (the coalition of religious leaders) will be determined to appease God at any cost.
Babylon in Revelation chapter 19, symbolizes the wickedness of the world, and will be destroyed at the Second Coming of Jesus Christ. If we follow God's command to come out of Babylon, we will not partake of the sins of the world, nor be overtaken in the plagues that will destroy it.
The covenant (New World Order) is yet to be signed; therefore, the Tribulation period has not started. The Tribulation will begin when the Antichrist signs a seven-year covenant with Israel. He will not fully honor that covenant but will break it in the middle of the 7 years, according to Daniel’s Vision – (see Dan 9:27). As soon as that New World Order is signed, according to scripture, that will usher in the tribulation period.