No, we won't and will be tested to see if we are in the faith. That's what it will be all about! It won't matter then what denomination you are, just do you believe/trust in Jesus and His word. No secret Christians then. If you don't believe the mark will be real, you are already setting yourself up to be deceived.
1Now we request you, brethren, with regard to the coming of our Lord Jesus Christ and our gathering together to Him,
2that you not be quickly shaken from your composure or be disturbed either by a spirit or a message or a letter as if from us, to the effect that the day of the Lord has come.
3Let no one in any way deceive you, for
it will not come unless the apostasy comes first, and the man of lawlessness is revealed, the son of destruction,
4who opposes and exalts himself above every so-called god or object of worship, so that he takes his seat in the temple of God, displaying himself as being God.
5Do you not remember that while I was still with you, I was telling you these things?
6And you know what restrains him now, so that in his time he will be revealed.
7For the mystery of lawlessness is already at work; only he who now restrains
will do so until he is taken out of the way.
8Then that lawless one will be revealed whom the Lord will slay with the breath of His mouth and bring to an end by the appearance of His coming;
9that is, the one whose coming is in accord with the activity of Satan, with all power and signs and false wonders,
10and with all the deception of wickedness for those who perish,
because they did not receive the love of the truth so as to be saved. 11For this reason God will send upon them a deluding influence so that they will believe what is false, 12in order that they all may be judged who did not believe the truth, but took pleasure in wickedness.
I know when the Lord will come back too... It will be on the feast of trumpets (Rosh Hashanah) about two years after the AD/idol is set up in Jerusalem on the Temple mount. Just count it down when you see the AD, and watch for the signs in the sky.

This is when the parousia (Mat 24, Rev 6-coming, presence) will happen. Jesus teaches us this in Mat 24.
The Day of the Lord follows and will run 1 year and 10 days (trumpets and bowls) and then Jesus will take possession of the kingdom (Rev 19-20, Mat. 25), this will be on the day of atonement. Therefore Jesus fulfills the fall feasts, just like He did the Spring feasts. This is key. These are "appointed days", so it has to be on these.
If you want to know why I know the day and hour, read "The Last Shofar", by Lenard and Zoller. It will answer all your questions. A sneak peak is it was a well know expression in Jesus' day, an idiom. A hidden day, but the Jewish folk knew what He was talking about.

It would be like us saying turkey day is going to be soon- in the USA, or Santa is coming soon. We know when these days are. Same thing.
15“Therefore when you see the ABOMINATION OF DESOLATION which was spoken of through Daniel the prophet, standing in the holy place (let the reader understand),
16then those who are in Judea must flee to the mountains.
17“Whoever is on the housetop must not go down to get the things out that are in his house.
18“Whoever is in the field must not turn back to get his cloak.
19“But woe to those who are pregnant and to those who are nursing babies in those days!
20“But pray that your flight will not be in the winter, or on a Sabbath.
21“For then there will be a great tribulation, such as has not occurred since the beginning of the world until now, nor ever will.
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.
23“Then if anyone says to you, ‘Behold, here is the Christ,’ or ‘There
He is,’ do not believe
him. 24“For false Christs and false prophets will arise and will show great signs and wonders, so as to mislead, if possible, even the elect.
25“Behold, I have told you in advance. 26“So if they say to you, ‘Behold, He is in the wilderness,’ do not go out,
or, ‘Behold, He is in the inner rooms,’ do not believe
them. 27“For just as the lightning comes from the east and flashes even to the west, so will the coming of the Son of Man be.
8For the LORD has a day of vengeance,
A year of recompense for the cause of Zion.
7‘He who has an ear, let him hear what the Spirit says to the churches.
Who we going to trust??? Jesus or men?