One question for Christians

[Jackalope]

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Regarded the bolded bit, the speed of light has been measured independently, both within and without Earth's atmosphere, many times - since the late 17th century, and within the margin of error for a particular experiment, the measurements are in agreement.

If you're suggesting that there is enough variability in the speed of light to allow for young earth claims, you're going to have to come up with some mechanism that would allow for the speed of light to increase by many orders of magnitude while staying coherent with all other observations.

Rotsa ruck with that one, GC.

P.S. There's a damn good reason why the speed of light has never been measured in a "true vacuum". Do you know why?

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You’re overplaying your hand a bit; the one-way speed of light has never been empirically measured, it’s impossible to synchronize the clocks in order to do so.

You have reason to suspect that it's not synchronous? Please, feel free to suggest a testable hypothesis to explain how the speed of light through the same medium is dependent on travel direction.

Please do. We could use a laugh.