This is a quote by Greg Koukl: "So let's set the record straight. Faith is not the opposite of reason. The opposite of faith is unbelief. And reason is not the opposite of faith. The opposite of reason is irrationality." He goes on to say that there is such a thing as irrational faith. For example if you are having an operation, you would put faith in your doctor that he would do a good job. That would be a rational faith. However if your friend, who did not even study Medicine, decided to operate on you and you believed that they would do a good job, that would be an irrational faith.
Like I mentioned before in my previous post, religious texts are not scientific textbooks so you cannot apply the scientific method to disprove/prove its claims. However (like I mentioned in my previous post) there are ways of confirming certain aspects of the text as science continues to advance (The field of study is called religious epistemology). Yes you need faith to believe in your religion, I agree with that completely. But if your religion describes a worldview which is incoherent and inconsistent with what you see around you, and you believe in such a religion, that would be an irrational faith. As such, believing in your religion need not be a blind leap in the dark. Logic and reason can go a far way as to what is true and what is false.