The rapture of God's elect, his Bride the Church, is not in question. The timing preached, of God's elect, his Bride the Church's rapture is in question. Scriptures tells us that God's elect, his Bride the Church's rapture is with the return of Christ, after the great tribulation.
From Matthew 24, after the great tribulation, at the return of Christ, the God's elect, his bride the Church, gets raptured, before there will be weeping and gnashing of teeth for those not raptured:
Matthew 24 (NKJV)
29“Immediately after the tribulation of those days the sun will be darkened, and the moon will not give its light; the stars will fall from heaven, and the powers of the heavens will be shaken. 30Then the sign of the Son of Man will appear in heaven, and then all the tribes of the earth will mourn, and they will see the Son of Man coming on the clouds of heaven with power and great glory. 31And He will send His angels with a great sound of a trumpet, and they will gather together His elect from the four winds, from one end of heaven to the other. 36“But of that day and hour no one knows, not even the angels of heaven, but My Father only. 38For as in the days before the flood, they were eating and drinking, marrying and giving in marriage, until the day that Noah entered the ark, 39and did not know until the flood came and took them all away, so also will the coming of the Son of Man be. 40Then two men will be in the field: one will be taken and the other left. 41Two women will be grinding at the mill: one will be taken and the other left. 42Watch therefore, for you do not know what hour your Lord is coming. 50the master of that servant will come on a day when he is not looking for him and at an hour that he is not aware of, 51and will cut him in two and appoint him his portion with the hypocrites. There shall be weeping and gnashing of teeth.