Well yes anyone can make up a religion but that doesn't mean they're Legally and constitutionally recognized by the federal government. The satanic temple became a legally recognized religion in 2019 and therefore is entitled to the same representation and leeway as any other religion...

Personally, I think religious studies are important to avoid the racisim and bigotry that often comes with ignorance of other peoples beliefs. But people fear what they don't know and don't like to learn about what they fear. Thus, the wheel of unnecessary ignorance turns on and on.