Free software is strictly more ethical than nonfree software. Any attempt at arguing otherwise basically boils down to a rationalization of 'but I want to make money', which is not a tenable ethical stance. I'm not saying it's wrong per se, but it doesn't inspire goodwill or good sentiments either. Trying to deride people with a strong sense of ethics regarding software production and use by comparing them to religious fanatics is misguided as best, malicious at worst.