Camera render overwrites material color I have placed a camera with the following world properties

The scene looks as following

Now when I try to render, all I get is

And that is of course what I do not want. I simply want the colors to appear as they are given and that the blue is merely the background (such that I can easily remove it in Photoshop for a transparent image). I've also tried without placing a spot light but to no avail.
Blue background is not just a paper that is blue. It basically means that the scene is filled with blue light thus your object seems blue.
You can set a transparent background from Render Properties panel under Film from the Transparent checkbox.