I’ll see the Sack of Constantinople, and raise you the sale to Mehmet’s army of the canons that breached the walls in 1453 by a Hungarian (Latin) Christian armorer.
The ‘decadence’ charge is part an parcel of the ‘Englightenment’ attempt to disposess Christianity of its Roman heritage, to claim ‘the glories of Rome’ for the re-paganizing impulse of modern rationalism. It goes back to Gibbon.