Then you've got the wrong book...
It is not just those that are Raptured that become the Bride of Christ...It includes all Christians who have passed on before them...
Those that were 'left behind', were left behind because they did not accept Jesus as their Saviour while they had the opportunity...If they accept Jesus as their Saviour during the Tribulation, they will not be bastards...They will not be part of the Bride of Christ...They will be friends of the Bride and Groom...They will make it to heaven, but not as the Bride...
Although there were many Christian martyrs in times past, I suspect most Christians thru-out history died of disease or bad health (old age) of one sort or another...They will be with us at the Rapture...
Well put.
Thx.