Even though religious schools are common in Australia, many government schools provide religious instruction (RI) classes. Religious instruction involves students being segregated into faith based groups so as to receive instruction in the beliefs and practices of "one" religion. This practice also occurs in many other countries. In Australia, the provision of RI in government schools has become increasingly controversial, resulting in numerous government reviews, law and policy changes and frequent media coverage. In this paper, I examine Australia's RI laws, policies and other relevant literature. I argue that RI aims to indoctrinate. Consequently, it may conflict with educational efforts to combat the sorts of thinking and problems that characterise the 'post-truth world' - that is, a world flooded with disinformation, conspiratorial thinking and science denialism, which fosters social divisiveness and undermines effective responses to serious global problems (e.g. COVID-19, climate change). A more educational alternative to teaching about religions is recommended.