One small point or question to add to the thought on Rapture or pre-trib rapture. If you think the timing of the rapture happens in conjunction with the "last trumpet" mentioned in 1 Corinthians, and you believe that this last trumpet sounds prior to the tribulation then how do you account for the 7 additional trumpets sounded in Rev. 8 through 13?
If the rapture takes place before the tribulation should we not read at the last trump... except for the 7 more that will come.
Interestingly enough, I think there is a case to be made that the last of the 7 trumpet judgements could be the last trump.
From Rev. 11: And the seventh angel sounded; and there followed great voices in heaven, and they said, The kingdom of the world is become the kingdom of our Lord, and of his Christ: and he shall reign for ever and ever.
16 And the four and twenty elders, who sit before God on their thrones, fell upon their faces and worshipped God,
17 saying, We give thee thanks, O Lord God, the Almighty, who art and who wast; because thou hast taken thy great power, and didst reign.
18 And the nations were wroth, and thy wrath came, and the time of the dead to be judged, and the time to give their reward to thy servants the prophets, and to the saints, and to them that fear thy name, the small and the great; and to destroy them that destroy the earth.
19 And there was opened the temple of God that is in heaven; and there was seen in his temple the ark of his covenant; and there followed lightnings, and voices, and thunders, and an earthquake, and great hail.
and later in 12
12:10 "And I heard a great voice in heaven, saying, Now is come the salvation, and the power, and the kingdom of our God, and the authority of his Christ: for the accuser of our brethren is cast down, who accuseth them before our God day and night. "
The events that follow the seventh trumpet sound like a plausible heavenly view of what 1 Corinthians describes. If this is the last trump, it happens after the breaking of the 7th seal so it cannot begin the tribulation.
In addition, Paul makes mention about the conquering or destruction of death and this does not occur until Rev: 20
14 "And death and Hades were cast into the lake of fire. This is the second death, even the lake of fire."
IMHO there is a thin enough case for a "Rapture of the Church" at all. There is little to no case for a pre-tribulation rapture.