5 Your second question is discussed by Tertullian in his books on Monogamy where he declares that the children of believers are called holy because they are as it were candidates for the faith and have suffered no pollution from idolatry. Consider also that the vessels of which we read in the tabernacle are called holy and everything else required for the ceremonial worship: although in strictness of speech there can be nothing holy except creatures which know of and worship God. But it is a scriptural usage sometimes to give the name of holy to those who are clean, or who have been purified, or who have made expiation. For instance, it is written of Bathsheba that she was made holy from her uncleanness, and the temple itself is called the holy place.
Source: Letters (New Advent)