The main religious followings in the Gladstone community are:

• 45.7% - No religion
• 17.4% - Catholic
• 11.2% - Anglican
• 3.1% - Uniting Church
• 2.5% - Presbyterian and Reformed 
• 2.3% - Christianity, nfd
• 1.8% - Baptist
• 1.4% - Pentecostal
• 1.2% - Hinduism
• 0.9% - Buddhism

In addition to 45.7 per cent of the community stating they had no religion, a further 8.1 per cent did not respond.

This equates to 18,650 community members either with no religion or unknown and 14,754 who reported religious affiliation.

There has been an increase of 22.2 per cent of community members stating they had no religion between 2011 and 2021.