Faith Alone Faith Only in the Blood is insufficient for Salvation.

Just like FAFO, water only is nothing. IE, infant baptism.

A matter is confirmed (one's salvation) by two (water and Spirit) or three (Spirit, water and Blood) witnesses.

1 John 5:7-8

For there are three that testify: the Spirit and the water and the blood; and the three are in agreement.

John 3:5

Jesus answered, “Truly, truly, I say to you, unless someone is born of water and the Spirit, he cannot enter the kingdom of God.

Therefore, faith in the Blood is the prerequisite for water, and water is the prerequisite for receiving the Spirit for the forgiveness of sin.