What does ‘God is Holy’ mean?

God

What does ‘God is Holy’ mean:

Most would define Holy as: Good, righteous, sanctified, and pleasing to God. This definition is correct. However, Christianity teaches only God is Holy. Meaning, only God is good, righteous, sanctified, and pleasing to God.

These qualities extend to all creations of God that are not corrupted by the freewill of Man. While this concept may seem derogatory to man and his freewill, it is simply a matter of fact. According to Christianity, everything that exists outside the will of God (i.e. the will of Man) must be, by definition, unholy.