Ok, first off I do belong to any one religion. Sexist is sexism anywhere buddy, I don't care where you are from. In a culture where women has less right then men and what not, its sexist. End of discussion. I am against it because I have stated many time, it is sexist to anyone. And why even bring up baptism? Its not even in the game. If we want to go there, I am also against circumcision, a practice by all Abrahamic religions that includes Christian, Muslims, and Jews. Again, you have ignored the part where I am also taking into consideration on how the females of Maplestory will feel, which you probably don't care about because they are females.
You're still not objecting to the fact that women are not property, they're not pets you can just have multiple of. If you want a polygamy relationship with people, fine, but don't try and inject it into the game. Would you also argue that women should be allowed to have multiple husbands?