But who is part of the holy nation? Only ordained clergy and canonized saints? Isn't the faithful peasant part of it? If he is part of the holy nation, he is holy, and a holy one is a saint. Can unholy people be members of the body of Christ and enter the kingdom of heaven?This notion that "the New Testament sometimes uses 'saints' in a general sense for all believers, therefore canonized Saints GO AGAINST THE BIBLE!" is just silly. For instance, in the Old Testament, Israel is called "a kingdom of priests and a holy nation" (Exodus 19.6), but that doesn't preclude a priesthood from amongst the "kingdom of priests" that are particularly called to the role of priests. It's the same thing here.
"Saint" as a prefix is really just shorthand for "those whom the Church has recognized as being particularly worth of honor and emulation." The debate around this subject is really just playing with semantics and the word-concept fallacy.
Orthodoxwiki says: In the Holy Scripture, the word saint is used to refer to those who have been set apart for the service of God, consecrated for his purposes. As such, all members of the Church are called saints, regardless of their personal holiness or sinlessness. It is still appropriate to use the term in this way.
Then it goes on to talk about canonized saints, but the term itself refers to all members of the Church.