The only "true" way of figuring all this out, is the perspective of these dates. For instance, is it Shire reckoning, or the Elven calendar, or is it perhaps the calendar, and timeline of the Gondorians. Did the Istari Wizards, sent by the great Valar, have anything to do with forging the timeline?
Was the destruction, perhaps NOT done by the Babylonians, but instead by a great Goblin horde, led by a half-orc named Azog. Speaking of "half-orcs", maybe, just maybe, it was a large, hunting orc party, riding upon the backs of direwolves, that felled the great city of Jerusalem.
Now THAT would be some "unclean things", defiling the temple, am I right? Now, lets not forget that 70 years, if orcs DID destroy Jerusalem, could ONLY have been 70 Lunar years, as orcs cannot be in direct sunlight, and most likely, would have had to stop their whole destruction thing every morning at sunset.
More importantly, when we count the 2520 years from this destruction, a GIANT invisible Dragon went to war, in another dimension, called the spirit world, with a God-Prince named Michael. The battle might have lasted, like a year and half, or something like that, and the "good guys" had bird wings, but the "bad guys" had bat wings, and were all kicked out of Middle Earth, or maybe Westeros.
And if we count over 100 years from that, there is currently a 7 headed wild beast, dragon, that has a female rider on her named Khaleesi. Also we shouldn't have pre marital sex, because this Dragon wants to devour us, like a lion, and we should ONLY listen to 7 guys who are old, and come from Brooklyn, and know EVERYTHING, and maybe there is 7 of them, for each of the 7 heads of the dragon, or maybe not.