Vic Scaravilli is a Catholic who put the following on his website here. I’m reposting it (with permission) and note that Evangelicals would agree that this is the gospel, with some nuances about baptism.
The Basic Gospel Message
By Vic Scaravilli
God loves each one of us. He loves me and He loves you with an unconditional love. You are precious in His eyes.
There is something that has kept us separated from God, something that has kept us from experiencing His love in our lives. That something is called sin. The result of sin is spiritual death. We have all sinned and never can be perfect.
Does that mean we can never know and experience God’s love? No, because God loved us so much He sent His only Son to die for each one of us. Jesus is the only bridge that takes us from our sin to the love of God. By His death and resurrection, Jesus opened the gates of heaven for everyone.
This is called salvation. It is the free gift of eternal life that is completely given to us by God’s grace. Salvation is the life in Jesus that begins now and will be for all eternity.
The free gift of salvation must be accepted in order for it to be our own. We must experience an internal conversion experience that changes our hearts. Once we accept Jesus into our hearts and allow Him to come into our lives, we begin to experience His love.
In order to become children of God, we must be born again. The sacrament of Baptism forgives your sins, gives the gift of the Holy Spirit, restores the grace lost by Adam, and makes you a member of His family.
This is the gift of salvation. We have the opportunity of eternal life because of what Jesus did for you and me. All we have to do is personally accept it by faith and be obedient to Him. Baptism and conversion are required to begin this process.
Jesus paid a debt He did not owe because we owed a debt we couldn’t pay.