All atonement mentioned in scripture in the OT, are for Israel and not for any other nation or people.
Of course certain foreigners could join themselves to the people of the Lord.
So the atonement is only for the people of God so that their sins are forgiven them.
v31, When the priest made the atonement, the sins were forgiven them who had sinned.
So the concept of atonement is to forgive the sins of the sinful transgressor who sinned against God, and it was not open ended to apply to anyone else. It was national and individual to Israel only.
Leviticus 4
27 ‘If anyone of the common people sins unintentionally by doing something against any of the commandments of the Lord in anything which ought not to be done, and is guilty, 28 or if his sin which he has committed comes to his knowledge, then he shall bring as his offering a kid of the goats, a female without blemish, for his sin which he has committed. 29 And he shall lay his hand on the head of the sin offering, and kill the sin offering at the place of the burnt offering. 30 Then the priest shall take some of its blood with his finger, put it on the horns of the altar of burnt offering, and pour all the remaining blood at the base of the altar. 31 He shall remove all its fat, as fat is removed from the sacrifice of the peace offering; and the priest shall burn it on the altar for a sweet aroma to the Lord. So the priest shall make atonement for him, and it shall be forgiven him.
Jesus is our great high priest who makes atonement (NT word propitiation ) for the sins of the people (of God only)
And further proof is that those who believe in Christ have their sins forgiven them so that they will not perish, as John 3:16 says.
There is no unlimited open ended atonement for all sinners, the atonement is only for believers.
People still go to hell with their sins unforgiven, unatoned for , unpropitiated for. Propitiation means the turning away of wrath from an offended God against sinners who transgressed against Him. And the WRATH of GOD abides on them who do not believe.
The OT was signs and symbols of Christ, and He is our great high priest, the great shepherd of the sheep, Christ is not the priest of the world. The world has no forgiveness of their sins, no atonement, no propitiation, for to have an atonement means they have the forgiveness of their sins. And Christ told us that if you do not believe in Him, you will die in your sin unforgiven.
So the priest shall make atonement for him, and it shall be forgiven him.
No doubt some will object and quote me this, applying the propitiating atonement to the unbelieving world,
1 John 2:1-3 New King James Version (NKJV)
The Test of Knowing Christ
1 My little children, these things I write to you, so that you may not sin. And if anyone sins, we have an Advocate with the Father, Jesus Christ the righteous. 2 And He Himself is the propitiation for our sins, and not for ours only but also for the whole world.
The Test of Knowing Him
3 Now by this we know that we know Him, if we keep His commandments.
HOWEVER, the unbelieving world has to be joined to the people of the LORD to have their sins atoned for.
So the atonement is limited.