Funny, Hebrews 11 names all the folks that lived BEFORE “the cross” - dispensationalism is as silly as supercessionism is evil.
And Peter says that 'salvation' was offered to them FIRST, IPeter 3 and 4, that would make all those that believed the 'Gospel' Christians. God is dispensing HIS time and He had His elected prophets to write it all down for us to know the seasons...