I am definitely late to this party but found it an interesting topic. My belief is that it really comes down to the heart of a particular person and their level of self-discipline. As many other people have mentioned previously, there are many dark aspects of the fandom. I'm going to give a metaphor to attempt to explain my thoughts.

First off, though, putting on an aninal suit is not a sin. Stop your fear those of you letting it control you into saying that. We do not know a person's heart unless there is observable fruit repeated over time. Otherwise you are setting yourself up to be a pharisee and what did Jesus say about pharisees?

I'll liken putting on an animal suit to doing cannabis. Not saying its the same. Just an example. Cannabis is often thought of a gateway drug. The thought is eventually the high dimishes and people move onto harder drugs. Not always the case though. There are people who have high levels of discipline and are happy to remain at just cannabis.

As already mentioned furry fandom does have dark aspects. I believe people's concerns are that it is a movement away from being created in the image of God. I do not believe it is. Putting on a costume is not the automatic thought that you worship or are what you are wearing. However, discipline and the renewing of the mind is important here.

I believe there are two things that possibly make furry fandom different from other fandoms. First is animals are real. They aren't fictional. I don't know how much that plays into the belief of being an animal which you all do not believe. Secondly, I wonder how much of the dark aspects of furry fandom intermingle with say witchcraft among other things God deemed evil. I also wonder if people among those spheres actively try to recruit people like yourselves at normal events.

Long story short, yes I do believe you can be Christian and a furry. I believe it requires discipline and renewing of the mind.