Sources are kinda conflicting on whether or not Chirrut is Force Sensitive.
After finishing the book "Guardians of the Whills" last night, based on how it describes him getting around it sure sounds like force sensitivity, so I would say StevenO could be right about just not being trained in Use the Force. It leaves you with only the bare minimum, enough to be "Spiritual" and not throwing Storm Troopers around with your mind.
When you go around (in a SW film) saying: "I am one with the force and the force is with me", then you are either
Force Sensitive or totally nuts! If you also do incredible stunts of melee fighting, you are most likely not nuts. If you also see even though you are blind, the jury is back with a guilty verdict, you are definitely
Force Sensitive.
Also Star Wars Saga is a game, when you feel the need to emulate something seen on screen, you don't go around inventing the wheel all over again. You just use the skill, feat or talent that best fit the ability in question. If you want to invent something new, go right ahead, but try to make it fit within the framework of the game.
In my way of thinking, Chirrut could even be trained in
Use the Force, but he has not gained the
Force Training feat.