"Why is the Lord's Prayer read at the beginning of each day in the House of Representatives and Senate if Australia is a secular nation?"

At the beginning of each sitting day in the House of Representatives and the Senate prayers are read. These were added to the Standing Orders (the rules) of the House of Representatives in 1901 and of the Senate in 1903. Since this time the reading of prayers has been reviewed several times.

In 2010 both houses introduced an Acknowledgement of Country before the reading of prayers at the start of each sitting day.

You can learn more about the order of business of the House of Representatives and the Senate with these links.

diagram to help explain Why is the Lord's Prayer read at the beginning of each day in the House of Representatives and Senate if Australia is a secular nation?