Let me see if I understand what's being said:
The dispensationalists believe that this division occurs AFTER the rapture and tribulation time and describes those left on earth, nonChristian and those who were converted during.
And the rest of you believe that this event happens practically simultaneous with the rapture and the Great White Judgement seat event? (and perhaps deny there is a rapture at all?)
Dispensationalists teach a 1,007 years between the two resurrections. The church is raptured out, the dead in Christ rise, and are gone. Then the seven years tribulation, with the first 3.5 of it being trib, and after the anti-christ is revealed, and destroyed, then 3.5 years of great trib. At the end of this, Jesus comes with His saints, and fights, and defeats satan. Then at the end of His "reign" here, the dead in sin come forth at the GWT judgement, and are sentenced to the lake of fire. The problem I have with this is that when Jesus came forth from the grave that third morning, He defeated satan.
1 Cor. 15:54-58
54 So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory.
55 O death, where is thy sting? O grave,
where is thy victory?
56 The sting of death is sin; and the strength of sin is the law.
57 But thanks be to God,
which giveth us the victory through our Lord Jesus Christ.
58 Therefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labour is not in vain in the Lord.
Now, in the amil, you have a general resurrection, where Jesus comes in the Cloud. The dead in Christ shall rise first. Those who are alive and remain, shall be changed in the moment and twinkling of an eye, and they too, shall join Jesus in the cloud. Then the dead in sin also rise, are rendered guilty, and cast into the lake of fire.
1 Thess. 4:13-18
13 But I would not have you to be ignorant, brethren, concerning them which are asleep, that ye sorrow not, even as others which have no hope.
14 For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God bring with him.
15 For this we say unto you by the word of the Lord, that we which are alive and remain unto the coming of the Lord shall not prevent them which are asleep.
16 For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God:
and the dead in Christ shall rise first:
17
Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
18 Wherefore comfort one another with these words.
Matthew 31-46
31 When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory:
32
And before him shall be gathered all nations: and he shall separate them one from another,
as a shepherd divideth his sheep from the goats:
33 And he shall set the sheep on his right hand, but the goats on the left.
34 Then shall the King say unto them on his right hand, Come, ye blessed of my Father, inherit the kingdom prepared for you from the foundation of the world:
35 For I was an hungred, and ye gave me meat: I was thirsty, and ye gave me drink: I was a stranger, and ye took me in:
36 Naked, and ye clothed me: I was sick, and ye visited me: I was in prison, and ye came unto me.
37 Then shall the righteous answer him, saying, Lord, when saw we thee an hungred, and fed thee? or thirsty, and gave thee drink?
38 When saw we thee a stranger, and took thee in? or naked, and clothed thee?
39 Or when saw we thee sick, or in prison, and came unto thee?
40 And the King shall answer and say unto them, Verily I say unto you, Inasmuch as ye have done it unto one of the least of these my brethren, ye have done it unto me.
41
Then shall he say also unto them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:
42 For I was an hungred, and ye gave me no meat: I was thirsty, and ye gave me no drink:
43 I was a stranger, and ye took me not in: naked, and ye clothed me not: sick, and in prison, and ye visited me not.
44 Then shall they also answer him, saying, Lord, when saw we thee an hungred, or athirst, or a stranger, or naked, or sick, or in prison, and did not minister unto thee?
45 Then shall he answer them, saying, Verily I say unto you, Inasmuch as ye did it not to one of the least of these, ye did it not to me.
46 And these shall go away into everlasting punishment: but the righteous into life eternal.
Here, you can see where Jesus gives the Sheep and the goats their reward, at the same place and time. So, I think the amill position is the way to go. But, if you are unsure, read, study, and pray that God gives it to you, and not man.