It is clear that our tradition is telling us that Abraham's faith was not a blind faith but instead clarified from a spiritual struggle which ultimately led him to believe in the One God. Faith unquestioned can lead to dangerous fanaticisms whose adherents claim to speak in the name of God. In contrast to Abraham's mid life spiritual crisis is the narrative of the Akedah, the binding of Isaac. When God commands Abraham to offer his son as a sacrifice, Abraham responds with a knee jerk reaction. When we consider the possible outcome of the Akedah, the killing of one's own son in the name of God, we can only be horrified.
Blind faith has no way of safeguarding itself against evil.
This blind faith exhibited by Abraham in the Akedah seems out of character in light of the story of Sodom and Gomorrah. Here Abraham has the courage to question whether God is acting ethically in seeking to destroy the inhabitants of these cities. It would be reasonable to conclude that what Abraham demanded of God, he would, first of all, demand of himself. We will never really know what was going through Abraham's mind when he was preparing to sacrifice Isaac. The Torah only tells us the bare facts and does not relate inner thoughts.