I wholeheartedly agree that religion should not interfere with science, but I do not think that religion should be abolished.
When it comes to religion, there is such a diverse spectrum of people and beliefs even in a single denomination, and I have to say that not all of them are incompatible with science. Unfortunately, the more rational people are not the ones that are seen in the news, or trying to infiltrate science classes. In short, there are Christians who do not disagree with the big bang theory, evolution, the age of the planet etc, but simply view the magnificence of it all as divine. For them, science and religion are compatible. You are also correct in that short of a second-coming you will never have data to support faith, it is the antithesis of science.
I am not entirely sure Santa Clause and the like are such a bad thing. My parents never raised me to believe in Santa Clause, but the older I get the more I realize that it seems to be a human trait to want to believe in something bigger than oneself. Humans repeatedly demonstrate that we are not wholly rational beings. I am simply not sure, good or bad, of what a perfectly rational human society would look like. Part of me is afraid that they would be less human in a way.
Summary: I don't have any answers, but I would be very careful about trying to remove all irrational traits of humanity.