This is an argument that Satan would make. Just watch and pray. What do you do when a new Christian begins to ask difficult questions on doctrine? When you begin to teach the word of God, you will understand how much we need to debate the issues. Let's practice swinging the sword around among friends so we will be ready to face the enemy when the time comes.
I’ll stick to my original concept, and suggest that Satan might operate more to divide than to unite the core believers at this point. Do you really think Jesus is going to have this as his main agenda, to reward the people in “right group A” and punish the people in “wrong group B” when both A and B were essentially doing the works commanded, and the world around them was evil and destructive, and plotting the utter destruction of both groups? If so, then you believe in a different Jesus.
Sure, there will be time for judgement of the churches, but we as individuals in those churches (and synagogues) need to understand what the times portend, and what we need to be doing now in these circumstances. I am, for example, not a Mormon but I admire the principled stand they took in California and I am in solidarity with them in their current difficulties with the forces of antichrist who have risen up against them. I am not a Roman Catholic but I admire the current Pope and the previous incumbent.
I find the tendencies of the priestly class still among us, to debate the finer points of theology and ritual, when such huge issues loom over us in the world, to be just like the attitudes of the scribes and Pharisees, in fact sometimes I wonder if there is any essential difference between the two periods of history at all.