Hired help are not devoid of their beliefs, and just because one is or can be hired help does not mean one must do something that one finds objectionable based on one’s religion. This is because the activity is being used to further something the person does not believe in from a moral foundation.
Clearly, you do not run a business that actually sounds money on creating specified products because this is not the same as someone coming a buying something off a store shelf or in restaurant. When asked to cater or produce specific products for a specific event, one is directly participating in a specific function. And you know this is the case of direct participation because if the event got cancelled, none of that stuff could be resold because of its specificity. If I cannot use it elsewhere, I am specifically and directly participating.
I also use myself as the example. I refused outright in grad school in the late 80s (a teaching grad school environment where you were essentially cheap hired help) to do any procedures or anything dealing with abortion. So what is it was part of the curriculum and services offered. I was not going to have anything to do with it. And so what if I could be hired help by someone. Others were shocked because the profs told me, “I had no option.” and I could not go forth is I did not. Yeah, right. I ignored told them flat-out, I did not partake, and still got great grades. They figured quite smartly that I was not the type to be bullied to act against my religious convictions.
The bottom-line is being hired help does not mean one leaves one’s morals behind or ignores them in the process.