Were Neanderthals Religious?

Neanderthals built complex structures, captured birds to ornament themselves with feathers, and successfully hunted mammoth and other formidable megafauna with tools.

But does any of the evidence suggest that they were religious? It's notably tricky to infer religious behavior from material culture, as I've written about here before regarding Gobekli Tepe, a possible 11,000-year-old modern-human temple.