Buz, this may or may not belong in this topic, but I do suggest (in the non-admin mode) that you also consider taking part in the
Why Have Religious Subsidies topic.
That said, I wonder what portion of the funding of museums are directly from the government? I suspect it may well be small, but I really don't know.
A comparable item would be the government subsidies for libraries. Would you argue that such funding should also go towards purely religious libraries?
It would seem that a creationist museum would fall into that area between a standard museum and a church. And it certainly would be wrong for the government to be subsidising a church (but that gets into that other topic).
Cheers,
Moose