I don't believe that I suggested that doubt is the opposite of faith, quite the contrary.
It was Tertullian to whom the quote is originally ascribed and given as if from a heathen (Apologeticum, 39, 7).  
Religion, in the sense I use it, is the virtue of religion derived from that of Justice.  The Church is absolutely necessary to the salvation of the world (though not as Fr. Feeney would have had it) though sanctity is a grace extended by God to all that accept it, whether Christian or not.  Mass is the duty of the baptized Catholic in right relationship to that virtue.  Any hindrance is to sanctity is on the part of the people of making up the institution, whether cleric or lay, and should not be held against a liturgy, poor homily or otherwise, properly prayed.