Googling "Michelle Go memorial vandalized" returns one relevant result. That result is this Reddit thread. Everything else is "missing: vandalized" so safe to say this isn't true.

I'm not really sure what you mean by a new religion that mixes the two faiths. They're both Abrahamic religions, Islam being an offset of Judaism. It's sort of like saying you want to create a new type of pizza by mixing cheese and pepperoni pizza. Sure, you can like, put less pepperoni on it, but it's still a pepperoni pizza.