In your opinion what causes christians to believe in Jesus

[Sheldon]

As hilarious as light without a source sounds it's probably the least of the crimes against reason that this bronze-age creation myth is guilty of.

Not only can light have a multitude of sources besides the Sun (the premise of my STRAW MAN

This straw man is ignoring the context, unless you can evidence another source of light that sustains vegetation on this planet? 

 light is always independent from it's source. 

Magically? I mean dullard that I am, the word source suggests something to me John? 

Surely, you know many of the stars we see at night no longer exist. The source is gone, all that's left is unshackled, independent light crossing the universe.

And you think this could sustain vegetation on this planet without our sun, seriously? Is this where you've been heading? 
All this to lend the absurd claims in the creation myth in Genesis some credibility, so as to deny scientific facts about the age of the earth.