You're confusing two different definitions of blessing, 1. blessing as a gift from god; 2. blessing as an act of calling God's favor upon something and consecrating it.
Do you pray before meals? That's a form of blessing #2. God already "blessed" us with the food but still we should pray before meals. It's the same with houses (or new undertakings, or marriages, etc.). Even if you don't think evil spirits are lurking in your home, you still want God's favor on your home and you want it to be a space particularly set apart for holiness.
On a side note, many Pennsylvania Dutch, who have Anabaptist background, will bless their houses in the form of framed cards containing prayers, hung somewhere in the house.
I'm curious of your response.
(on the side note: The Mennonite and Amish that I know up in Lancaster county don't usually hang anything up except for a calendar. No wall decorations... Even very plain colors - but anyway...)
With the two types of blessings you describe, I believe I'm having trouble with the logic with the two types of blessing more than the definitions. Of course we all believe that God has given us blessings - ie - He has blessed us with a home. Consecration (speaking in the EO definition of consecration as dedication of a church/home/building and NOT sacramental) I'm having trouble with understanding the logic behind it. If God has given us a blessing, he created it and those who have built it....
I'm curious on the following questions.
1) Wouldn't God knowing all things understand that a home is dedicated to him by how the members of the home follow him? Since he being the creator of everything has given a blessing to you, wouldn't the dedication (consecration) of this blessing be proven by the actions of the dwellers rather than the church coming in and "saying so"?
2) When it is prayed to remove evil spirits does it work? Are the EO still tempted by the evil spirits after the abode is blessed and they are "taken away"? If its speaking literally of "evil spirits" like "haunting", then do the EO believe that the promise given to man from the story of Job is not valid (where satan can't directly attack man)? If it is not directly speaking of haunting, I'd ask if it was logical to pray to remove these evil spirits, when you know you'll just be tempted by them anyway in the abode.
Now I will say that despite the Anabaptist homes that I've seen, I've also seen MANY Eastern Orthodox homes (even more EO than Anabaptist) where the families and "dwellers" DO live up Christians lives. Hope I didn't come off sounding that way in my OP. But I do believe that the EO Christians that live this way, would live this way and dedicate their homes to God whether or not the home was actually blessed....