Rather than blurring the render and setting it on lighten or color dodge or something, try directly incorporating the render into the background so the whole thing is cohesive. Also, I reccomend trying a different font. Graffiti pastel color text doesn't really blend well with a gritty middle eastern crusades theme. Try a more neutral font like times new roman but with spaces between the letters, and pick a color out of the render itself.
Here's an example of what I'm talking about (font and color choice)
