We are saved when we obey the gospel.

To hear the gospel, and to be baptized in Jesus name for the remission of our sins, we need a preacher sent by God that preaches the gospel.

"How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher?" - Romans 10:14 KJV

"And how shall they preach, except they be sent? as it is written, How beautiful are the feet of them that preach the gospel of peace, and bring glad tidings of good things!" - Romans 10:15 KJV

What do they preach? They preach the same gospel that the apostle Peter preached on the Day of Pentecost when the church first began. He then preached how to obey the gospel:

"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." - Acts 2:38 KJV

"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 2:39 KJV