While it's true the name given the followers of Jesus Christ the Messiah as Christian, began at Antioch, but the name given to whosoever believed in the Messiah were His followers and believers before the advent of His first coming. Because they heard the Gospel of Christ the Messiah and believed according to grace through faith in the same manner we hear the Gospel preached and by grace through faith believe in Christ. The Old Covenant faithful saints learned of the Messiah to come through the Law and Prophets, while after His coming, we now hear of Christ preached through His body; the Church. You can argue the name Christian began around the time of Pentecost, but you cannot argue there were not faithful saints of Old who believed in the Messiah, Christ Jesus our Lord from the beginning of creation. For even in the days of Adam & Eve the prophesy of one who would come to crush the head of Satan has been foretold, and whosoever heard and believed were numbered among the followers of Christ (Christians) even though the name Christian was not yet known to the world.
Acts 11:26 (KJV) And when he had found him, he brought him unto Antioch. And it came to pass, that a whole year they assembled themselves with the church, and taught much people. And the disciples were called Christians first in Antioch.
Galatians 3:8-9 (KJV) And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham, saying, In thee shall all nations be blessed. So then they which be of faith are blessed with faithful Abraham.
Matthew 11:13-14 (KJV) For all the prophets and the law prophesied until John. And if ye will receive it, this is Elias, which was for to come.
Matthew 5:17 (KJV) Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.
Romans 10:18-21 (KJV) But I say, Have they not heard? Yes verily, their sound went into all the earth, and their words unto the ends of the world. But I say, Did not Israel know? First Moses saith, I will provoke you to jealousy by them that are no people, and by a foolish nation I will anger you. But Esaias is very bold, and saith, I was found of them that sought me not; I was made manifest unto them that asked not after me. But to Israel he saith, All day long I have stretched forth my hands unto a disobedient and gainsaying people.