The book of Revelation does not agree with you, Giovanna.
In Rev. 15:2-3, first the seven last plagues are described as about to be poured out. Then follows the description of those who will go through it:
“And I saw...them that had gotten the victory over the beast...”
Next, follows a tie in with Christians who will be around when these endtime plagues of the wrath of God are poured out (they sing the song of the Lamb), not directed at them, and the Israelites under Moses (they sing the song of Moses) who experienced similar plagues in Egypt:
“And they sing the song of Moses the servant of God, and the song of the Lamb.”
You know in my line of work, you gotta be able either to sing "The Battle Hymn Of The Republic" or "Dixie" with equal enthusiasm... dependin' upon present company.
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.