It has nothing to do with bible passages or christians, that is the smoke screen under which Folau is trying to get out of the penalty for committing an act that is against the law.
The
Sex Discrimination Act 1984 is an
Act of the
Parliament of Australia which prohibits discrimination on the basis of sex, marital or relationship status, actual or potential pregnancy,
sexual orientation, gender identity, intersex status or breastfeeding in a range of areas of public life.
These areas include work, accommodation, education, the provision of goods, facilities and services, the activities of clubs and the administration of Commonwealth laws and programs.
Folau breached the terms of his contract by discriminating against gays, it's that simple.