If a few liars who we have never heard to tell the truth come to us at different times and report the same news we may well find ourselves having no truthful report on the same matter believing them.
But when tens of thousands of Prophets men who never told a lie during their lives and hundreds of thousands of saints and millions of believers who have adopted truthfulness as one of the most essential pillars of belief have all agreed on the existence of God is it at all reasonable to reject their unanimous testimony in preference for the individual reports of a few liars?