Real religion cannot be opposed to intellect.
Do not believe that in religion you cannot trust your intellect. The force of our intellect must support the foundations of every real faith.
— William Ellery Channing
If God, the object of our faith, is higher than our understanding, and if you do not understand Him, it does not mean that you should not use your intellect trying to understand Him.
— Fyodor Strakov
While ye have light, believe in the light, that ye may be the children of light. These things spake Jesus, and departed, and did hide himself from them.
— John 12:36
In order to understand the truth, you should not suppress your intellect. On the contrary, you should purify your intellect, exercise it, and intellectually try and test everything which we can possibly put to the test.