Christians Are Atheists

Why is it called northern mythology when they talk about Thor and Odin, but when you come to God and Allah it's suddenly called religion? The difference is of course that most of us have realized that Thor and Odin don't exist. Only a few of us have realized that the others are just fantasy too. I mean christians are atheists when it comes to Thor and Odin. It's like saying, "I know Batman and Superman is just fantasy, but I have a close and personal relationship with Spider-man."