This presumes of course, that both Catholics and Protestants regard godless secularism as a greater threat to the common good than they do each other.
After a few years on the FR religion forum, however, I'm afraid I've lost my innocence and I'm no longer sure that this is the case.
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I am not sure that I understand your post.
The above is the post to which I was responding. I will not presume to speak for marshmallow, but if I understood him/her correctly, we agree that there is little hope left for a reconciliation between Catholics and Protestants. I know I see too much distrust here daily to believe otherwise.
My point is that there is always hope, depending on where you place your hope. Mine begins and ends in the character and sovereignty of God, who causes "all things to work together for the good of those who love Him" (Romans 8:28). If your own pope thinks there's hope for a relationship between Catholics and Muslims, why shouldn't there be a greater hope for reconciliation between Catholics and Protestants, who at least believe in the same Triune God and Risen Lord?