RE: If science started 2000 years ago, do you think religion would be as big as it is?
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Offense is not intended, but the question is semi-ill-posed. One has to acknowledge the former as being a (bi-)product of the latter, which would necessitate the latter to then precede that etc. ad absurdum.

One had might as well ask whether or not religion will be what it is in 2000 years from now, which is addressable: no. Time is embedded in a circle (repeating) wherein a cycle of approx. 25 920 years encloses a rising (ie. golden age) and a falling (ie. dark age) of consciousness; the former being defined by "knowledge"-based enlightenment principles, the latter being defined by "belief"-based idolatry resulting from the patriarchal coveting of women. The last golden age apex was approx. 11 500 BCE and the last dark age approx. 500 CE. Present-day humanity still has an excessive overhang of patriarchy captured by the "mercy upon mankind" idolatrous "belief"-based religions of Christianity and Islam which have their roots in Canaanite idol worship.

Once "belief" is undermined as a viable state upon which to sustain any body (ie. individual, political, national etc.), a new age of knowledge will commence and the pathological "believers" move down the circle as needed, whereas the ones who pursue true knowledge move up the circle as merited. Time is a circle - approx. 1008 moon cycles comprises an average human incarnation commencing some-when in the 25 920-year cycle, each according to their own "being". One incarnation contains the totality of the "circle of life" and to each their own conscience/choices.

RE: My first reaction to that statement? How do you know that value to 4 significant figures?
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It is an acknowledgement of/to the existing Platonic model which approximates it such.

There are technicalities related to calculations of significant figures insofar as it may relate to (conscious) choices made while incarnated. In short; no incarnation cycle can exist more than 21 solar years, the exact "time" becomes incalculable given "time" is relative to the observer, thus if a being is sufficiently bound (ie. repetition) in an ongoing state, this effectively changes the "area" of the circle/cycle in question. It is a frame of reference problem because the measurement is being made while embedded and/or subject to it. Because I am not wholly unbound, I don't know the correct figure thus adopt the Platonic model which may (or may not) be proposed by beings more capable of comprehension than I.