its not a belief, they based it on evidences, whether its is the
truth or not, we dunno. on what type of evidences they find, like
scrolls, scriptures, archaelogical artefacts or carbon dating
etc.
if it is based on beliefs and hearsay, alot of people will
disregard it. however it is based on some evidences dug up by them,
its worth looking into the matter. I sure hope more researchers
will go study on the evidences dug up by them and then debate among
themselves within the researching community if this is a hogwash or
otherwise.
To be fair to christianity, there are evidences found along the
years. Scrolls found from the sea, tomb still exist,
the manger Jesus was born still exist (sad was now made under the
church).
Sad to say, these I have listed don't have any effect to tell us
God is effective and mean what he says (if you believe there is a
god).