To what Extent were the Policies of Isabella and Ferdinand of Spain Motivated by Religious Considerations?

Religion, during Isabella and Ferdinand's reign was held in extreme high regard; however it is unfair to say that Isabella and Ferdinand's policies were motivated solely by religious issues. The Crown did on occasion, place 'spiritual health' above matters considered to be more mundane and conventional - but I believe that there was a lot more than religious issues responsible for their actions.
Isabella was regarded as an extremely religious queen; she viewed religion as truly authentic and pure, she felt it her duty as queen to 'fight Satan in all forms and to rid him of her kingdom'. …