Yeah. The force is in everyone. Some are just better at it than others. And some put in more effort into honing their skills because they were adopted by the Jedi Order.
Is Sabine force sensitive? Not very. Can she wield the force and become a Jedi? Yes, but it’ll be harder for her than others.
Was Chirrut force sensitive? Not very, but he could sense some people around him and the force would guide his fighting.
Was Finn force sensitive? Yes, but we’ll have to wait and see how much. Hopefully lots and we get to see Jedi Knight Finn.