Everyone has sinned and needs salvation. Salvation comes by grace through faith based on the atoning sacrifice of Jesus Christ. (See Romans 3:23-25; 6:23; Ephesians 2:8-9.)
The saving gospel is the good news that Jesus died for our sins, was buried, and rose again. We obey the gospel (II Thessalonians 1:8; I Peter 4:17) by repentance (death to sin), water baptism in the name of Jesus Christ (burial), and the baptism of the Holy Spirit with the initial sign of speaking in tongues as the Spirit gives the utterance (resurrection). (See I Corinthians 15:1-4; Acts 2:4, 37-39; Romans 6:3-4.)