In my post about the Rapture on August 10th I said that I think the Rapture will happen just before the final year of the Tribulation. Of course if I am correct, then living believers will have to deal with the Antichrist and his mark. God has provided believers to endure the tribulations of life when He sealed us with the very power of God - the Holy Spirit.
"In Him we were also chosen as God’s own, having been predestined according to the plan of Him who works out everything by the counsel of His will...And in Him, having heard and believed the word of truth—the gospel of your salvation—you were SEALED with the promised Holy Spirit." (Ephesians 1:11, 13)
This power with which we have been "sealed" will prevent us from taking the mark of the beast. To worry about such a time brings sorrow to God and is simply a matter of not trusting Him.
"And do not be causing sorrow to the holy spirit of God by which you are sealed for the day of deliverance." (Ephesians 4:30)
Again, believers in Christ Jesus are "sealed with the promised Holy Spirit" and this power will enable us to refuse the mark of the beast and endure the consequences, if any.
"Then the beast was permitted to wage war against the saints and to conquer them, and it was given authority over every tribe and people and tongue and nation. And all who dwell on the earth will worship the beast—all whose names have not been written from the foundation of the world in the Book of Life belonging to the Lamb who was slain. He who has an ear, let him hear: “If anyone is destined for captivity, into captivity he will go; if anyone is to die by the sword, by the sword he must be killed. Here is a call for the perseverance and faith of the saints." (Revelation 13:7-10)
I feel certain believers will stand firm to the end and see the salvation of the Lord just as he delivered Judah from the Moabites.
"You need not fight this battle. Take up your positions, stand firm, and see the salvation of the LORD on your behalf, O Judah and Jerusalem. Do not be afraid or discouraged. Go out and face them tomorrow, for the LORD is with you.’ ” (2 Chronicles 20:17)