Two colleagues debating marriage equality over a couple of beers is not unusual. Throw in a Bible, TV camera and a parliamentary lawn, and things start getting a little, well, strange.

Federal Liberal MPs Tim Wilson and Andrew Hastie are the unlikely stars of a debate sponsored by the Bible Society of Australia and Coopers Brewery.

The moderated debate was shot in the grounds of Canberra's Parliament House, and shows Mr Wilson, an openly gay agnostic, and Mr Hastie, a Christian conservative, debating marriage equality while drinking Coopers Premium Light beer.

Titled "Keeping it Light", the video is part of a joint campaign between the Adelaide brewer and Bible Society Australia "to reach even more Australians with God's word".