What is the gospel? (3/3)

Every day you are to provide a year-old lamb without defect for a burnt offering to the Lord; morning by morning you shall provide it. You are also to provide with it morning by morning a grain offering, consisting of a sixth of an ephah with a third of a hin of oil to moisten the flour. The presenting of this grain offering to the Lord is a lasting ordinance.So the lamb and the grain offering and the oil shall be provided morning by morning for a regular burnt offering.   Ezekiel 46:13-15

What is the gospel?  What is the faith once delivered to the saints?  One of the earliest confessions from a Greek liturgical manuscript, called the Dêr Balyzeh Papyrus, was discovered in Egypt about a hundred years ago, and was probably written in the early second century:

I believe in God, the Father Almighty,
And in his only-begotten Son
Our Lord Jesus Christ,
And in the Holy Spirit
And in the resurrection of the flesh,
And in the holy catholic church.