Being a philosophical naturalist does not mean that one thinks that science can provide all of the answers. That is scientism and that is wrong. I don't think a billion buckets of science could speak to the problems raised by the Tea Party. Being a philosophical naturalist does not mean that one thinks that the only truths are those of science. I think the claim just made in the last sentence is true but I don't think it is a claim of science. It means that you use science where you can and you respect and try to emulate its standards.