Having a religious title/job doesn't make you spiritual.
Spirituality has to do with your relationship with God or with your Higher Power. That relationship can be damaged or broken. It's hard to judge what kind of relationship another person has with his/her Higher Power. But it is generally reflected in their actions toward others.
No, a single misstep (depending on what it is) does not mean someone isn't spiritual, but when it becomes habitual, it's a pretty good bet something is "off" in the spirituality department.