The author to the Hebrews lists as foundational the following (Heb 6:1f):
- repentance from dead works
- faith toward God
- instruction about washings [or baptisms]
- the laying on of hands
- the resurrection of the dead
- and eternal judgment
When I read this I wondered to myself how many of us 21st century Christians would list the same things as foundational to our faith. Having said that, I think a fair number of Catholics and Charismatics might (with different understandings of what the words mean of course). Sadly you would not hear anything like that coming out of my mouth (reformation needed).
It is interesting though that understood in context the author's list is really an expression of faith in the story of a Christian's life, when we are so often told today that redemptive-historical is the New Testament way of describing faith. An interesting comparison is Tertullian (AD 155-220) who wrote the following summary of the teaching of Christ, or rule of faith:
Now, with regard to this rule of faith—that we may from this point acknowledge what it is which we defend—it is, you must know, that which prescribes the belief that there is one only God, and that He is none other than the Creator of the world, who produced all things out of nothing through His own Word, first of all sent forth; that this Word is called His Son, and, under the name of God, was seen “in diverse manners” by the patriarchs, heard at all times in the prophets, at last brought down by the Spirit and Power of the Father into the Virgin Mary, was made flesh in her womb, and, being born of her, went forth as Jesus Christ; thenceforth He preached the new law and the new promise of the kingdom of heaven, worked miracles; having been crucified, He rose again the third day; (then) having ascended into the heavens, He sat at the right hand of the Father; sent instead of Himself the Power of the Holy Ghost to lead such as believe; will come with glory to take the saints to the enjoyment of everlasting life and of the heavenly promises, and to condemn the wicked to everlasting fire, after the resurrection of both these classes shall have happened, together with the restoration of their flesh. (source)
Again, sadly, not like something you would come out of my mouth (except thanks to CofE liturgy when reading the creed). Like the earlier list of the author of Hebrews it is a story. However it is a different story. Nevertheless it is in perfect harmony with the biblical letter's whole argument, and a few verses later the link between the two stories is made (v.6).
The gospel is a many faceted jewel which can be described in a multitude of different ways. We should not try and make other Christian's sound the same but listen to all the different stories in wonderful harmony. But this embrace of diversity within the church does not remove all boundaries, or embrace 'multiple' gospels. As Tertullian saw his summary could raise 'no other questions than those which heresies introduce', and in extension we should reject all discordant notes in the different 'core stories' Christians tell, and recognise their danger.
Just wandering in thought...