I suggest that we need to recover the sense in which the Gospels are testimony. This does not mean that they are testimony rather than history. It means that the kind of historiography they are is testimony. An irreducible feature of testimony as a form of human utterance is that it asks to be trusted. This need not mean that it asks to be trusted uncritically, but it does mean that testimony should not be treated as credible only to the extent that it can be independently verified.
There can be good reasons for trusting or distrusting a witness, but these are precisely reasons for trusting or distrusting. Trusting testimony is not an irrational act of faith that leaves critical rationality aside; it is, on the contrary, the rationally appropriate way of responding to authentic testimony. Gospels understood as testimony are the entirely appropriate means of access to the historical reality of Jesus.
It is true that a powerful trend in the modern development of critical historical philosophy and method finds trusting testimony a stumbling-block in the way of the historian’s autonomous access to truth that she or he can verify independently. But it is also a rather neglected fact that all history, like all knowledge, relies on testimony. In the case of some kinds of historical event this is especially true, indeed obvious.Richard Bauckham, Jesus and the Eyewitnesses (Eerdmans, 2017), 5.