It appears that your post got cut off at the end, Laura.
Revelation 13 talks about the Beast whom people will worship, and I believe this to be the Antichrist.
Revelation 13:5 And there was given unto him a mouth speaking great things and blasphemies; and power was given unto him to continue forty and two months. 6 And he opened his mouth in blasphemy against God, to blaspheme his name, and his tabernacle, and them that dwell in heaven. 7 And it was given unto him to make war with the saints, and to overcome them: and power was given him over all kindreds, and tongues, and nations. 8 And all that dwell upon the earth shall worship him, whose names are not written in the book of life of the Lamb slain from the foundation of the world.
How could this beast make war with the saints if they've already been 'raptured'? Revelation 13 goes on to talk about another beast that forces people to make an image of the first beast to bow down and worship it:
Revelation 13:11 And I beheld another beast coming up out of the earth; and he had two horns like a lamb, and he spake as a dragon. 12 And he exerciseth all the power of the first beast before him, and causeth the earth and them which dwell therein to worship the first beast, whose deadly wound was healed. 13 And he doeth great wonders, so that he maketh fire come down from heaven on the earth in the sight of men, 14 and deceiveth them that dwell on the earth by the means of those miracles which he had power to do in the sight of the beast; saying to them that dwell on the earth, that they should make an image to the beast, which had the wound by a sword, and did live. 15 And he had power to give life unto the image of the beast, that the image of the beast should both speak, and cause that as many as would not worship the image of the beast should be killed. 16 And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads: 17 and that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name. 18 Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is Six hundred threescore and six.
As you know, Revelation also says that:
Revelation 14:9 And the third angel followed them, saying with a loud voice, If any man worship the beast and his image, and receive his mark in his forehead, or in his hand, 10 the same shall drink of the wine of the wrath of God, which is poured out without mixture into the cup of his indignation; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb: 11 and the smoke of their torment ascendeth up for ever and ever: and they have no rest day nor night, who worship the beast and his image, and whosoever receiveth the mark of his name. 12 Here is the patience of the saints: here are they that keep the commandments of God, and the faith of Jesus.
13 And I heard a voice from heaven saying unto me, Write, Blessed are the dead which die in the Lord from henceforth: Yea, saith the Spirit, that they may rest from their labours; and their works do follow them.
Again, how could people die in the Lord during this reign of the beast if they're no longer here? I suppose your father-in-law could argue that these were people saved after the rapture, but there is no Scriptural evidence to support that. In fact, it is not until the next section of this chapter that we read:
Revelation 14:14 And I looked, and behold a white cloud, and upon the cloud one sat like unto the Son of man, having on his head a golden crown, and in his hand a sharp sickle. 15 And another angel came out of the temple, crying with a loud voice to him that sat on the cloud, Thrust in thy sickle, and reap: for the time is come for thee to reap; for the harvest of the earth is ripe. 16 And he that sat on the cloud thrust in his sickle on the earth; and the earth was reaped.
I believe this reaping is what most people would refer to as the rapture. I could be wrong about this, though, so if anyone can provide correction, it would be appreciated.
EDIT: I posted this while you were editing your previous post, so I didn't read all of it until after I got this out there. I don't know if those people under the altar in Revelation 5 are those that died by the hand of the final antichrist, or all of those who have been martyred down through the ages, including those who were murdered by the Catholic Church. There's a lot about Revelation that still confuses, me, too.