THE "WRATH" OF GOD:
God's wrath is real, severe, and personal. The idea that God is not angry with sinners belongs neither to the OT nor to the NT. God is a personal moral being who is unalterably opposed to evil and takes personal actions against it. Wrath is the punitive righteousness of God by which He maintains His moral order, which demands justice and retribution for injustice.
God's wrath is an expression of His holy love. If God is not a God of wrath, His love is no more than frail, worthless sentimentality; meaningless; and the cross was a cruel and unnecessary experience for His Son.
The Bible declares that all people are "by nature children of wrath" [Eph. 2:3] and that "the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who suppress the truth in unrighteousness" [Rom. 1:18]. Since Christians have been "justified by His Blood, we shall be saved from wrath through Him" [Rom. 5:9].
"The day of the Lord's wrath" [Zeph. 1:18] is identical with "the great day of the Lord" [Zeph. 1:14].
These terms refer to "the wrath of the Lamb" [Rev. 6:16], Jesus Christ, that will fall on the ungodly at His second coming.