Useful feedback is nice, the question is if this is useful to the company, or just noise. I'll also note that the articles talking about this massive online protest are showing tweets with only a handful of retweets, not hundreds.
There has always been people that will complain about an ad or a product, we used to call them the "little old ladies from Hastings" here, though they may not have been old, ladies, or even from Hastings.
I come from the most agnostic country in the world, where the protests are usually done by militant vegans or politically active youth, not "conservative christians" - but also where the protests can get violent with freeing animals or firebombing places, which is quite the step away from just signing a petition. There's been a lot of fashion protests here, centring on boycotting H&M and the likes for producing clothes in countries where garment workers work for very little money in dangerous conditions for too many hours. Not the design on the shirt.

So they're allowed to protest the shirt, and we're allowed to roll our eyes at them. Everybody is happy.