Examples 3 through 5 are all the same. Christianity prohibits being worldly, if you can make a cake by separating the emotions from your mind temporarily and only use intellect and not emotion in your artistry, then maybe you are correct. But most artistry involves more that intellect, to the point that the baker expresses the celebration in a form of art. Same with a photographer. So if these artists are one in celebration, they are becoming one with the world. The mark of Cain is a misunderstanding of the Bible.