Finish the line: If religion never existed...
Here is mine:
all businesses would be open on Sunday.
...our world would look the same as it does now. It wouldn't be some grand utopia, nor would it be some chaotic dystopia. It'd just be full of people stumbling through life trying to get by, same as it is now.
Science, knowledge, cooperation in world betterment, would be progressed about two thousand years.