Beowulf the movie, does it go exactly by the epic poem?

The movie stays closer to the epic peom than similar movies like Troy, which I found dissapointing. It does bring a new element between Beowulf and Grendel's mom. We do get glimpses that Grendel's mom's true form is not the y miss Jolie but an ugly lizard type creature. In the origonal epic Beowulf doesn't use weapons or armor to fight Grendel because Grendel doesn't and he wants it to be a fair fight. The movie just takes it a step further and Beowulf discards all his clothing. I read Beowulf a few months before seeing the movie and I loved the movie. It stays as true to the original as you can really expect a movie to. They do mention christianity as the "new Roman religion" but are unfamiliar with it and say "Christjessus" like it's one word. Also don't spend 7 dollars. Spend 11 and see the 3-D version, it's totally worth it.