Essays / British Lit theme essay on Beowulf [6]

My assignment is to write a 1 pg essay on a theme presented in Beowulf. I have chosen Religion as my theme, but havent gotten any further. I havent written an essay in 7 years, and havent thought about themes for at least that long. I could choose another theme thats easy, but really want to use Religion. I cant figure out how to start the essay and wondered if anyone had some guidelines on writing an essay about themes. I cant seem to get anything worded right.