My Post Entitled "God Is Light"

Quality issues! The rejection reason was quality issues because the quality of the asset does not meet the required standard.

As @Jill_C says, the image is soft. My guess is that you overdid with noise suppression. In addition, there is chromatic aberration and your gradient contains visible steps.

Looking at your writings, I do not know what tool you used, but using a script font with outlines should show a continious writing and not single characters:

Additional thoughts: John in French is Jean, and in German Johannes. You are limiting the use of your picture to the English-speaking Christian world.

I agree with everything @Jill_C said.

Keep in mind that Stock is a global business. Due to regional, cultural and religious differences, Christian doctrine may have little significance to the majority of potential buyers.  You'll reach a wider audience with agnostic imagery.

Also, I would change the title to something more universal.  Light shining in darkness or light at end of the tunnel.

Why is it a png? That file type should be used only for images with transparency. The overall image is soft and blurry, and text in images should be avoided. Let the buyer add their own text.