God is, in the very essence of His nature, holy. He is necessarily holy as part of His perfection. A god that was not holy could not command respect or obedience from us. Were He like the idols gods in Paul's day with their female counterparts, we would not be inspired to worship Him, but to gratify our lusts.
Moses cried out after God had opened the Red Sea for deliverance from Egypt: "Who is like unto Thee, O Lord, among gods? Who is like unto Thee, glorious in holiness, fearful (awesome) in praises, doing wonders." Exodus 15:11. Can we not exclaim unto our God and Father, even more glorious praises, with thanksgiving, for having sent His Son into our sinful world to redeem us from our sinful state, and reconcile us unto Himself that our lives may overflow with His love and goodness? Revelations 4:8 has the four beasts crying out day and night: "Holy, holy, holy, Lord God Almighty, which was, and is, and is to come." "of all the attributes of God this one stands out with an excellency above all His other perfections. None is sounded so loftily, with such solemnity, and so frequently by the angels that stand before His throne as this." On the attributes, Charnock. God's holiness is manifested in His laws given to men. If we admired His holiness as much we do His goodness and mercy, we would seek to attain more holiness in our lives.