Comparing it to the Passion is, IMHO, an apples and oranges comparison. The Passion was meant to be as historically and biblically correct as possible. Risen is speculative fiction with regards to a Roman military tribune tasked with investigating the missing body. In as much as he is a fictional character, so is his dialogue with Bartholomew, Mary Magdalene, Pilate, etc. As a period piece, it makes you feel as though you were there, and as fiction set amongst a historic backdrop, it is very believable. There is little if anything that committed Christians will take issue with, but, IMHO, the movie better serves the purpose of planting seeds among the skeptic/agnostic crowd.
Dogmatics and apologetics aside, it remains a tight, interesting story.
+1