God describes who He is talking about when He speaks about those Who come to know Him during the Tribulation.
And it is not anyone who has been saved during the Age of Grace. That is the present age we are in, by the way.
Those who are Christians in this present day and age will not go through the seven years of the wrath of God as described in Revelation.
So you have no problem believing in man, with his ability to aim smart bombs destroying only the target without hitting civilians; yet seem to have a problem believing God can do the same thing. I refer to the endtime plagues in the book of Revelation in which God is described doing this very thing.
GOD KNOWS HOW TO AIM!
As a former pretribber myself, I know where you are coming from, Giovanna, but, I must tell you that an escape hatch is just not there.