I don't think it's a matter of being correct or incorrect, but of what the epistemic standards are. Should we be rational or faithful and trusting? To the extent that science drives cultural narratives, it's a question of whether theism is a useful hypothesis. And theism isn't since it posits a greater mystery and therefore doesn't explain anything.

Secular advertisers are pretty good at branding. They've made a science out of it. And secular symbols co-opt and trivialize religious ones. Just look at the secularization and obfuscation of Christmas and Easter. In sophisticated, highly educated, rich societies, consumerism is more popular than religion. We also need to distinguish behaviour from lip service. Our self-image needn't match our actions, and the latter can speak louder than the former.