What is an apostate church?

"apostate" means " fallen away" so this refers to the general state in the last days of the church in general not adhering to its traditional essential beliefs.

By whom? They do not consider themselves to be apostate, certainly not as a whole. So your question needs to tell us who is considering them to be apostate.

The plural noun for church is churches.

In the christian belief, it isn't the building that is the church; A church is the body of believers, who meet within the building.

Apostasy is the total rejection of the Christian faith. I certainly don't believe Hasselbeck, raised a Catholic, has done that. I do, however, believe she is now a Protestant of some sort. I say that...