What was the point of view of the Ottoman thinkers or scholars in general to philosophy and in particular to subjects of the philosophy of religion and to philosophers? In Ottoman, what was the existence and level of philosophy according to the other sciences? These kinds of questions have been frequently asked by those who deal with philosophy. The answers given to these questions are as important as at least the questions. To discuss such an important subject, what we need is to accept scientific issues as basis. To answer these questions together with a different motivation which is far from scientific methods may lead us to a vicious circle. The first thing of this kind of scientific attitude is to examine the Ottoman thinkers' studies and try to understand them. General aim of this article is to shed a light to these discussions and in particular, to understand the approach of Harputlu Ishak Efendi to some issues of the philosophy of religion and his attitude towards some philosophers.