Most open source projects Code of Conduct boil down to "don't be mean to other contributors, treat them well". I'm sorry this makes you feel explicitly unwelcome. That said, it's never been a problem for me to adhere to that.
This is a first time for me being excluded, and it feels bad. I'm commenting on why this person has gone out of his way to do that.
Exclusion is not the norm in online programming spaces. Nor would we tolerate it if someone started excluding people on the basis of something like race. But seemingly there are apologists for exclusion on the basis of religion.