God sets the stars IN the firmament.

Again, the author showing his ignorance of the concept of deep space and the number and composition of stars and the distance that the stars are from earth.

He speaks of them as though they're pasted on the ceiling of the "firmament".

"... to give light upon the earth." Stars don't "give light upon the earth"!

The amount of usable light from stars is zero.

Again, evidence of the simpleton state of knowledge at the time this was written.