The Gospel is that God has kept, is keeping, and will keep His eternal promise to save His chosen people conditioned solely upon the Person and work of Jesus Christ.

The Good News - There is only one gospel, the news (not offer) of salvation accomplished by Christ for God's elect (Isa 61:1-3, Eph 3:11, Gal 1:6-9, 2 Cor 2:14-17)

Is - The news of God is what it is whether you believe it or not (Ex 3:14, John 10:26, 2 Cor 3:3-4, John 17:4, Heb 6:17-18

God Has Kept - God has caused and controlled all things so His covenant promise with His Son of life for His people would not fail, to the praise of the glory of His grace (2 Tim 1:1, Titus 1:2, Gal 3:13-20, Heb 6:13-18, Rom 4:16-18, Eph 1:3-5, Rom 5:17-20)

Is Keeping - God causes and controls all things so His promise of life eternal for His people will not fail. (Phil 1:3-6, 1 Thess 5:23-24)

His Eternal Promise - The covenant between Father and Son before creation, during creation, and forever (Gal 3:15-18, Heb 13:20-21, Titus 1:2)

To Save - God in power has redeemed His people and delivered them from the penalty of sin which He pours out on all other prepared by Him for destruction (John 3:15-18, Rom 9:22-24, Gal 1:3-5, Heb 4:3-5, 1 Pet 2:8)

His Chosen People - In Love, God's elect are chosen for life by God before creation as the objects of His mercy and grace (Eph 1:3-6, Rom 8:28-30, 2 Tim 1:8-11)

Conditioned on- Conditioned solely upon (Gal 3:13, Titus 3:5-7, Rom 11:5-6)

The Person - the Substitute who alone met all the inward and outward righteous requirements of God's Law and Justice for His people.

And Work - The Substitute who alone satisfied the wrath of God for the sins of His people (John 1:29, Gal 3:13-14, Isa 53:4-6)

Of Jesus Christ - The gospel concerns His Son, the promised Messiah, the only Mediator and Reconciler between God and His people, He is both human and God.

Alone - Jesus Christ makes the only difference between salvation and condemnation for every person who has lived, is living, or will live. (Gal 6:14, Matt 1:21)

By the powerful work of the Spirit of God, every believer in Jesus Christ (those given God's gift of faith in the complete saving work of Jesus Christ) belives the meaning of this gospel from the moment of regeneration on into eternity. (Mark 16:16, Eph 2:8-9, Rom 1:16-17) This is what it means to have faith in Jesus Christ, the One who truly saved all those He represented.  He did not save those He did not represent.  Faith in Jesus Christ is not a requirement for regeneration; faith is the immediate fruit of regeneration.