There is only one God. He is a Spirit. He was in Christ reconciling the world back to Himself, no longer counting people’s sins against them.

"To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them..." - 2 Corinthians 5:19

What did GOD do to reconcile us back to Himself?

He offered His flesh on the cross as a sacrifice for our sins. He was buried. On the third day, He rose again. The Father purchased us back with His own blood.

"Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which he hath purchased with his own blood." - Acts 20:28

"And, having made peace through the blood of his cross, by him to reconcile all things unto himself; by him, I say, whether they be things in earth, or things in heaven. And you, that were sometime alienated and enemies in your mind by wicked works, yet now hath he reconciled in the body of his flesh through death, to present you holy and unblameable and unreproveable in his sight: if ye continue in the faith grounded and settled, and be not moved away from the hope of the gospel, which ye have heard, and which was preached to every creature which is under heaven; whereof I Paul am made a minister;" - Colossians 1:20-23

What must WE do to be reconciled back to God?

We must obey the gospel by being sorrowful for our sins, turning away from them and turning to Jesus; we must be baptized by full immersion in water “in the name of Jesus” for the remission of sins; we must receive the gift of the Holy Ghost with the sign of speaking in other tongues as the Spirit of God gives us the utterance. (Speaking through us with words in a language we don’t understand. Acts 2:4, Romans 8:9)

On the Day of Pentecost, Peter preached to the people the death, burial, and resurrection of Jesus.

"Now when they heard this, they were pricked in their heart, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do?" - Acts 2:37

"Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost. For the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call." - Acts 2:38-39