I really don't believe this is Christianity's biggest problem. The animal issue is a huge problem and a huge problem in all religions, yet not the biggest problem.
Christianity's biggest problem is it's justification of extremes. That there is only two ways. Right versus wrong, good versus bad, positive versus negative.
Christians specifically justify their faults through forgiveness. Which is not an extreme. Yet still they cling to polar opposites including religion itself.
The vegan issue is also an extreme. They justify not eating animals by eating plants which shows extremes do not exist. Try eating nothing and see how long you live.
Is anything dying good or evil? 🤷🏻♂
Something is always at the loss in that picture. People, Animals Plants, Microbes or whatever.
Remember that without symbionic lifeforms, higher life forms would never exist.
Everything is dependent on everything else. So no extremes.
This even applies to extreme changes.
Is getting too much or too little sun or water good or bad? 🤷🏻♂
Too much or too little are still extremes.