Because He will be appearing soon as the Bridegroom to judge the House of God first for why many saved believers will be left behind to die but shall be resurrected after the great tribulation as vessels unto dishonor but still in His House.Again, why would I call on the lord to be saved when I believe in neither the lord nor the saving?
God's judgment of fire is coming on the third of the earth right after the everlasting gospel is preached everywhere by the first angel, which is right after the rapture.
That means you will see Him & that fiery calamity that is coming after the rapture. You will only have a moment to believe in Him to be saved then.