You also seem to be assuming quite a bit, don't you think? The moon just like the earth is under constant bombardment, something which is quite clear just from looking at the moon's surface. But unlike the earth, the moon has no atmosphere to help burn up asteroids before impact. So it is possible that the moon could have taken a good deal of punishment over all of these years.
Lunar impact rate:
On average, 33 metric tons (73,000 lbs) of meteoroids hit Earth every day, the vast majority of which harmlessly ablates ("burns up") high in the atmosphere, never making it to the ground. The moon, however, has little or no atmosphere, so meteoroids have nothing to stop them from striking the surface. The slowest of these rocks travels at 20 km/sec (45,000 mph); the fastest travels at over 72 km/sec (160,000 mph). At such speeds even a small meteoroid has incredible energy -- one with a mass of only 5 kg (10 lbs) can excavate a crater over 9 meters (30 ft) across, hurling 75 metric tons (165,000 lbs) of lunar soil and rock on ballistic trajectories above the lunar surface.
The lunar impact rate is very uncertain because observations for objects in this mass range are embarrassingly few -- a single fireball survey conducted by Canadian researchers from 1971 to 1985. Clearly more observations are needed if we are to establish the rate of large meteoroids impacting the moon.
Reference:
NASA on Lunar Impact Monitoring
If I were you I would not be so quick to say what the Moon should look like after 1400 years, such as your statement
"there should be a scar girdling the moon". Especially if such statements are just mere speculation and have no solid backing or support. You don't have any
proof that there should be a scar as you have stated, you just
believe that there should be one.
Not much different from Muslims
believing that the event took place if you ask me.