Rom. 8:9 tells us if we aren't in Him and His Spirit is not in us, we are none of His.
So how can we claim Christ as our Lord and savior first, before we receive His Spirit?
And when we are in the state of not have been given the Spirit of Christ yet, Christ is not ours, this means His word and the promises in His word are not ours yet either.
So how do we receive the Spirit of Christ " first," without making illegitimate claims on Christ, His word, and promises?
We do not receive the Spirit that empowers us to live right, and seals us unto the day of redemption, until we have faith, confess Christ, and repent of our sins.
That is why Paul said we are saved by faith, and not by works, for when we initially confess Christ we are in the flesh not having the Spirit yet, so that is all we can do is have faith, and our works have nothing to do with being saved when we are first saved.
If we receive the Spirit to empower us, and save us, before confessing Christ, then it would not be faith, for faith must be done while the person is still operating by the flesh, for then it is a choice they made.
If we receive the Spirit of Christ first and belong to Christ without confessing Christ then it could be said that OSAS would be true.
But since we receive the Spirit after having faith, confessing Christ, and repenting of our sins, then it can be stated that it is free will, and we make a choice in our salvation.
Joh 20:22 And when he had said this, he breathed on them, and saith unto them, Receive ye the Holy Ghost:
Joh 20:23 Whose soever sins ye remit, they are remitted unto them; and whose soever sins ye retain, they are retained.
Act 2:1 And when the day of Pentecost was fully come, they were all with one accord in one place.
Act 2:2 And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting.
Act 2:3 And there appeared unto them cloven tongues like as of fire, and it sat upon each of them.
Act 2:4 And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.
The disciples, and those that confessed Jesus, did not receive the Spirit until after Jesus shed His blood, was buried, and resurrected, completing the Gospel.
Act 19:1 And it came to pass, that, while Apollos was at Corinth, Paul having passed through the upper coasts came to Ephesus: and finding certain disciples,
Act 19:2 He said unto them, Have ye received the Holy Ghost since ye believed? And they said unto him, We have not so much as heard whether there be any Holy Ghost.
Act 19:3 And he said unto them, Unto what then were ye baptized? And they said, Unto John's baptism.
Act 19:4 Then said Paul, John verily baptized with the baptism of repentance, saying unto the people, that they should believe on him which should come after him, that is, on Christ Jesus.
Act 19:5 When they heard this, they were baptized in the name of the Lord Jesus.
Act 19:6 And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied.
These people were baptized unto John's baptism, and had not heard that they could receive the Holy Spirit, and then were baptized in the name of the Lord Jesus, and then they received the Spirit.
So they received the Spirit to belong to Christ after they had faith, confessed Christ, and repented.
Act 8:15 Who, when they were come down, prayed for them, that they might receive the Holy Ghost:
Act 8:16 (For as yet he was fallen upon none of them: only they were baptized in the name of the Lord Jesus.)
Act 8:17 Then laid they their hands on them, and they received the Holy Ghost.
The same as these people, for if they were baptized then they already had faith, confessed Christ, and repented, but they did not receive the Spirit until after they were baptized, not before it.
Act 10:45 And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost.
Act 10:46 For they heard them speak with tongues, and magnify God. Then answered Peter,
Act 10:47 Can any man forbid water, that these should not be baptized, which have received the Holy Ghost as well as we?
Act 10:48 And he commanded them to be baptized in the name of the Lord. Then prayed they him to tarry certain days.
These people received the Holy Ghost before baptism, but they already believed before receiving the Spirit.
Since we are saved by faith then we have to have faith, and confess Christ, and repent, before we can receive the Spirit to belong to Christ, for if we receive the Spirit to empower us, and belong to Christ before doing those things, then it is not faith.
If we receive the Spirit to belong to Christ before we confess Christ then OSAS would have a good argument.
Which would be what would happen if God chose them in the beginning for He would make sure that they came to the truth, for they do not have a choice.
But since we do not receive the Spirit to belong to Christ until after we have faith, confess Christ, and repent, then we have free will, and make the choice to receive salvation.
We can claim Christ as our Lord and Savior before we receive the Spirit to belong to Christ, for that is how it will be done, for it is of faith when we first believe