Apparently the teaching of Sanskrit is controversial in India because of its association with Hinduism, but as the article notes much ancient Sanskrit literature is non-religious anyway.
Part of the Indo-Aryan language group and indeed phonetically rooted in Proto-Indo-European language, it is the root of many. But it’s not a living language, so I can’t imagine anyone is suggesting it’s a language everyone should be taught to read, write and speak. It’s a bit like classical Greek and Latin in the English&European-speaking context. Everyone should be taught something about it, and some should be encouraged to study it for what it is. A “Sanskrit Week” celebration sounds reasonable?