Strong belief in a religion that is shown in the way someone lives. (Cambridge Dictionary)
The quality or state of being pious: such as fidelity to natural obligations (as to parents) or dutifulness in religion: Devoutness. (Merriam – Webster)
The quality of being religious or reverent. (Oxford Dictionaries)
A belief which is accepted with unthinking conventional reverence. (Oxford Dictionaries)
Purity and Piety.