The dispute is whether the system you have is closed or whether it leaves room for the grace of God. You see, everybody has a religious system. And if you think you don't have one, all that means is that you are not aware of the one who do in fact have. A religious system is nothing more than the clustering of beliefs into some sort of coherency. The question is whether that cluster of beliefs seeks to box God in or whether it allows God the freedom to act as he sees fit.
Christian denominations are religious systems.
And on the basis of today's gospel the question must be raised as to whether particular denominations represent closed or open systems. It isn't difficult to evaluate denominations on this basis. There are many today who seem to have everything all figured out. Their preachers will tell you exactly why people suffer illness or impairment. They will tell you who is saved and who isn't.