The Liberal Party's star candidate in the Canning byelection, Andrew Hastie, has ruled out a discussion of his religious beliefs while campaigning with former prime minister John Howard.

In a forthright statement at the start of a campaign appearance, the former SAS captain hinted that questions of his theology were being pushed by his political opponents.

Beliefs not relevant: Liberal candidate for Canning Andrew Hastie. Credit:Aaron Bunch

Mr Hastie's father is a Presbyterian minister who it is understood believes in creationism.

Asked about his own beliefs and the possibility he shared his father's creationist views Mr Hastie declared it was off limits.