Blind faith is trusting in something without any evidence. It has been described as a leap in the dark, a giving over of oneself to something despite a solid foundation. God does not expect us to have this type of faith.
God has revealed Himself to us. Romans 1:20 says, “For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse.” God is evident in creation. It may take faith to believe that God is Creator, but that faith is far from blind.
God has also revealed Himself through Scripture. In the Bible we read of God speaking to the patriarchs and prophets of the Old Testament. His manifest presence was with the Israelites (Exodus 13:21; Exodus 33:7-11). He gave us Scripture that we might come to know Him and trust Him (2 Timothy 3:16-17).
The greatest revelation of God is Jesus Christ. He is God Incarnate, the Word made flesh (John 1:1-5; 14). Jesus reveals to us the glory and character of God. Because He rose from the dead, His message is validated.
We, of course, also use the tools of science, archaeology, history, literary criticism, personal experience, and similar methods. These things give us evidence of the existence of God and of His character.
Therefore, our faith is not blind. We are called to love God with all of our minds (Luke 10:27). He does not expect us to blindly leap in the dark, but to understand His revelations and to take calculated steps of faith. We are to search the Scriptures and spend time getting to know God (1 Timothy 4:13-16). Yes, we do exercise faith. There are some things we will simply not understand (Isaiah 55:8-9; Psalm 139:6; 1 Corinthians 13:9-12). Even so, we can know that our faith is built on a solid foundation. It is based on God’s revelation of Himself and our understanding of that revelation. It is trusting and it is faith, but it is far from blind.