The antonyms for the word "religious conventions" may vary depending on context and interpretation. However, some possible antonyms could include secular gatherings, non-traditional ceremonies, alternative beliefs, unconventionality, and liberal spirituality. These terms may imply a departure from the strict adherence to traditional religious practices and beliefs, and a more open-minded approach to spirituality and worship. They may suggest a rejection of dogmatism, ritualism, and orthodoxy, in favor of personal freedom, diversity, and creativity. Thus, while religious conventions may foster uniformity and conformism, their antonyms may celebrate diversity and individuality in faith and spirituality.