Lets us look at The New Covenant
These Scriptures talk about the New Covenant.
Jer. 32:39-40, "I will give them one heart and one way, that they may fear me always, for their own good and for the good of their children after them. And I will make an everlasting covenant with them, that I will not turn away from them, to do them good, and I will put the fear of me in their hearts so that they will not turn away from me."
Ezek. 36:25-27, "I will sprinkle clean water on you, and you will be clean, I will cleanse you from all your filthiness and from your idols. Moreover I will give you a new heart and put a new spirit within you, and I will remove the heart of stone from your flesh and give you a heart of flesh. And I will put my Spirit within you and cause you to walk in my statutes, and you will be careful to observe my ordinances."
Deut. 30:6, "And the Lord thy God will circumcise thine heart, and the heart of thy seed, to love the Lord thy God with all thine heart, and with all thy soul, that thou may live."
Jer. 24:7, "And I will give them a heart to know me, that I am the Lord: and they shall be my people, and I will be their God: for they shall return unto me with their whole heart."
Jer. 31:31-34, "Behold, the days come, saith the Lord, that I will make a new covenant with the house of Israel, and with the house of Judah: Not according to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt; which my covenant they brake, although I was a husband unto them, saith the Lord: But this shall be the covenant that I will make with the house of Israel; After those days, saith the Lord, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people. And they shall teach no more every man his neighbor, and every man his brother, saying, Know the Lord: for they shall all know me, from the least of them unto the greatest of them, saith the Lord: for I will forgive their iniquity, and I will remember their sin no more."
Ezek. 11:19-20 "And I will give them one heart, and I will put a new spirit within you; and I will take the stony heart out of their flesh, and will give them a heart of flesh: That they may walk in my statutes, and keep mine ordinances, and do them: and they shall be my people, and I will be their God."
Heb. 8:8b, "Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah: Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they continued not in my covenant, and I regarded them not, saith the Lord. For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people."
Rom 6:3-7, "Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death? Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life. For if we have been planted together in the likeness of his death, we shall be also in the likeness of his resurrection:Knowing this, that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin. For he that is dead is freed from sin."
The disciples like all old testament saints did have their sins covered but they were not totally taken away until the day of Pentecost.
No old testament saint could truly receive Christ Himself
living within them as a reality.
I do not consider the Disciples as true Christians because it was impossible for them to have Christ within them before.
Now Acts 8 took place after the day of Pentecost so the New Covenant was totally available to any person who beloved.
Look at Acts 15:8, "And God, which knoweth the hearts, bare them witness, giving them the Holy Ghost, even as he did unto us;And put no difference between us and them, purifying their hearts by faith."
The Gentiles entered the New Covenant by faith and instantly received a new and clean heart.