The kind that is objectively verifiable.
I think we can agree that the bible contains the Christian God's holy scriptures, yes?
So perhaps if we had some of the following that would be considered quality evidence for God:
-- archeological relics that verify the existence of places and people in the bible
-- extra-biblical accounts that validate the historicity of Jesus Christ's ministry, death and resurrection
-- multiple, independent attestations that agree closely on the facts of Jesus Christ's life, death and resurrection.
-- the fulfillment of prophetic claims spanning hundreds of years between initial prophecy and fulfillment
Would you accept any of that evidence?