Providing someone a good does not make you a participant in whatever activity they choose to use that good for.<quoted text>
It's simple. By providing a cake for a gay wedding he's a participant. That is engaging in homosexual activities.
If Walmart sells me a gun and I use it to rob a bank, Walmart isn't a participant in the robbery.
If Food Lion sells me hot dogs and I cook them on my grill, Food Lion isn't a participant in my BBQ.