Salvation is a bloody thing...

Hbr 9:22 ... and without shedding of blood is no remission.

The Exodus/Passover - Exd 12:13 And the blood shall be to you for a token upon the houses where ye are: and when I see the blood, I will pass over you, and the plague shall not be upon you to destroy you, when I smite the land of Egypt.

Explained in the Law - Lev 17:11 For the life of the flesh is in the blood: and I have given it to you upon the altar to make an atonement for your souls: for it is the blood that maketh an atonement for the soul.

Fulfilled by Christ - At the last supper Jesus says: Mat 26:27 And he took the cup, and gave thanks, and gave it to them, saying, Drink ye all of it; 28 For this is my blood of the new testament, which is shed for many for the remission of sins.

It does require faith as Eph 2:8.9 says but, faith in Rom 3:25 {Jesus Christ} Whom God hath set forth to be a propitiation through faith in his blood

We see this at the OT Passover as well - Hbr 11:28 - 'By faith Moses,' Through faith he kept the passover, and the sprinkling of blood, lest he that destroyed the firstborn should touch them.

So it is not just FAITH .. the OBJECT of this faith is very important...it is faith IN the substitutionary blood sacrifice of Jesus Christ.