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This is something that actually brings up a lot of interesting questions in Christian theology. A lot of Christian thinking specifically centers around humanity and the special place that humans have within the world, having "rational souls" and being "made in the image of God." Therefore, it is not impossible for other beings to have been made with this formula, but it does raise a lot of questions. I think the multiple Incarnations is the most interesting possibility. Christians believe that God took on a human form as Jesus and shared his message with mankind, and I think the stance of the Catholic Church would be that this is a singular event - after all, it is considered so significant that we still use it as the basis of our dating system to this day. Aliens talking about crab Jesus probably wouldn't be the end of the world for Catholicism though. After all, God is supposed to be all powerful and so if He decided to become a man to save mankind there's nothing that would prevent Him from becoming a crab to save crabkind. I would still lean towards the Catholic church deeming that crabs must accept human Jesus and that their crab Jesus teachings are false, akin to Krishna beliefs encountered by missionaries in India. That said, Catholics also believe that Catholic teaching is so fundamentally true that it is possible to arrive at a lot of Catholic principles without Jesus having taught them, and so they would probably focus on how close the Crab Jesus religion is to Catholicism to try to convert Creezus followers to following Jesus.