Helen Keller was not born blind and deaf but became so at the age of 19 months after a serious illnessa mistake on our part in this initial recording.
Whether or not Kellers parents gave her limited instruction on a Creator God, there are other examples of an innate knowledge of God in Scripture, from Davids pronouncements in Psalm 22:910 to John the Baptists leaping in the womb at the presence of his Saviorplease see Made in the image of God.
We also know from Scripture that God knows useven before we are conceived (Ephesians 1:4). And Romans 1:20 holds us accountable for recognizing His existence, saying not just that it is evident but that the invisible things are clearly seen. Note that a seeing person has no advantage here over a blind one.