Australia and Waratahs full-back Israel Folau could be set for another showdown with Rugby Australia bosses after sparking outrage with more controversial social media posts on Wednesday.

Folau avoided punishment last year after stating homosexuals should go to "hell" unless they "repent their sins and turn to God".

Rugby Australia chief executive Raelene Castle spoke of the importance of using social media in a respectful manner after meeting the 30-year-old following his initial outbursts.

Folau has delivered another anti-homosexual post and caused a stir with his stance on the Tasmanian Parliament passing a legislation to make gender optional on birth certificates and allow people 16 years and older to legally change gender without parental contest.

The devout Christian posted a message on Instagram that stated "hell awaits" drunks, homosexuals, adulterers, liars, fornicators, thieves, atheists and idolaters along with "REPENT! ONLY JESUS SAVES".

He added: "Those that are living in Sin will end up in Hell unless you repent. Jesus Christ loves you and is giving you time to turn away from your sin and come to him."

Folau also weighed in with his position on the gender debate.

He tweeted a link to a story on legislation being passed in Tasmania and wrote: "The devil has blinded so many people in this world, REPENT and turn away from your evil ways. Turn to Jesus Christ who will set you free."