We walk by faith, not by sight. Faith is assurance of things hoped for, a conviction of things not seen. Subjectivity may be based upon emotions, imagination, or wishful thinking. Faith is more than subjectivity. Knowledge is based upon proofs and demonstrations.
Faith is less than knowledge.
Otherwise, faith could neither grow nor diminish. Here is the cheering, comforting part. Righteousness is imputed to us because of our faith, not knowledge. If I could know and do all truth, then justification could be earned and merited instead of being a gift of grace. Enough for you to accept Jesus and turn your life over to him in obedience.