" 1 page, double-spaces" describes how much you need to write for your assignment. So the piece must fill up one full page and double-spaces mean there is a blank line in between two written lines.
With that description, the reflection should contain about 28 to 29 lines. A reflection is a review so you write a review report on a comic book that you have read.
Probably too specific. Christianity is not the only religion, if you ask "what is religion" they won't only talk about Jesus, sorry if this doesn't help