You know pretty much nothing about that Concordat. You certainly can’t read it.
The fact that Mussolini himself was probably an atheist or an agnostic is irrelevant, what matters is what alliances he fostered politically. The point I was trying to make is that the traditional right tends to support the Church and its role in society (even if it's solely for opportunistic reasons) while the radical left is anti-clerical. Mussolini's relationship with the Church underscores the fact that his movement were by all rights the former.
As I told ZC, this whole "fascists were liberals" tack from people like Goldberg stinks of incredible ignorance and/or intellectual dishonesty.