“Blind faith” is trusting someone without knowing if that individual is worthy of being trusted. Giving that kind of trust to someone can be dangerous. I don’t know whether their promises are true or not. I have no personal knowledge about how apt they are to keep their word. I have no information from other sources about how trustworthy they are.
If I don’t know God personally, never read His Book, or never hear others speak of His trustworthiness, then my faith is a “blind faith.” But this kind of trusting is not dangerous, because the One in whom I believe is faithful Himself. As I get to know Him, as I read His Book, and as I hear others testify of his trustworthiness, my faith grows. My ability to trust Him to do what He says becomes stronger. I begin to see that He keeps His word. I begin to trust that He does what He says He will do. I begin to find Him truthful and worthy of being trusted. Because I find Him to be faithful, my trusting increases.
Hebrews 11:1 defines faith as “the assurance of things hoped form, the conviction of things not seen.” Another version (CJB) reads: Trusting is being confident of what we hope for, convinced about things we do not see. My faith works only because the One in whom I put my faith is faithful Himself, the One I trust is completely trustworthy. I may not see how things will work out, but He has a plan. He has promised to cause everything to work together for the good of those who love Him and who are called in accordance to His purpose (I love Him and my purpose is to bring glory to His name). [Romans 8:28] AND, He does not change lie or change His mind. [1Samuel 15:29]
His plans for my life – and yours – are good. They may not be easy, but in the end, they are spectacular. Think Joseph and his brothers. Think Daniel and the lions. Think Peter and the rooster. Think Jesus and the grave.