Very true.I'm saying that, for the claim that the moon was split in two, then stuck back together in the 600s, there should be evidence. It would be highly implausible that such a thing could happen without many people over a hemisphere seeing and recording such a spectacular event and without the event leaving physical scars.
http://en.wikipedia.org/wiki/Gervase_of_CanterburyFive monks from Canterbury reported to the abbey's chronicler, Gervase, that shortly after sunset on June 18, 1178 ... they saw "the upper horn [of the moon] split in two." Furthermore, Gervase writes, "From the midpoint of the division a flaming torch sprang up, spewing out, over a considerable distance, fire, hot coals and sparks ... In 1976 the geologist Jack B. Hartung proposed that this described the formation of the crater Giordano Bruno ... it can be reasonably hypothesised that Giordano Bruno was formed during the span of human history, perhaps in June 1178. However, the question of the crater's age is not that simple. The impact creating the 22-km-wide crater would have kicked up enough debris to trigger a week-long, blizzard-like meteor storm on Earth – yet no accounts of such a noteworthy storm of unprecedented intensity are found in any known historical records ... This discrepancy is a major objection to the theory that Giordano Bruno was formed at that time.
So an impact producing a minor crater within recorded history is ruled out because there is no record of it. It would definitely have been noticed, this creation of a 22 km wide crater. Imagine if the moon had been split in half by impacts. Would that have been noticed? Not for long, because the resulting debris impacts on the earth would have sterilised the entire surface of our planet! But there is no record of such an event. Needless to say.