What if someone had a code of conduct that was clearly about people treating each other well...but started it with "First, you must acknowledge that there is no God." Or "First you must acknowledge that Mohammad is God's messenger." Or "First you must accept the mitzvot as binding." Or "Brahman is Truth and Reality."
None of these is promoting inclusion.
That said: I'm an observer here. I haven't chosen to participate or not participate in the SQLite community because of this. I simply think it's a strange place to promote one's religion, and it doesn't surprise me that non-Christians might find it unwelcoming.