1. Henry used Parliament to separate the Church of England from the Catholic Church (even though he didn't have to do that).
2. Henry didn't really care about "religion" so much as he did his divorce. Therefore he left it very unclear exactly what the religious practices of the Church of England were.
3. He never solved the problem of a strong male heir, so the mess he left wasn't easily resolved.
Additionally, here's the homework assignment about Elizabeth. The reading can be found online here, and the questions here.