Photo shoots and funding announcements for sport and schools should have meant a smooth day on the election campaign trail for Opposition Leader Tony Abbott.

Visiting Penrith Christian School in the western Sydney Labor seat of Lindsay on Thursday, Mr Abbott talked about the "great" 700-student facility as he unveiled the coalition's schools policy.

But as he promised a coalition government would deliver $120 million more than Labor over the next four years, there was a distraction.

The Penrith school's online religious charter revealed a stance of which Liberal organisers say they were unaware.

"We believe that homosexuality and specific acts of homosexuality are an abomination unto God, a perversion of the natural order," the school's website reads.