The Labor party’s post-mortem analysis of this year’s election loss has pointed the blame squarely at Bill Shorten’s unpopularity.

While the result also pointed to a cluttered policy agenda that it failed to adequately explain to voters, it also said it suffered a drop in support from Christians.

"On the whole, people of faith did not desert Labor, but Labor lost some support among Christian voters – particularly devout, first-generation migrant Christians," the report stated.

"Other religious denominations did not swing decisively one way or the other."

Shorten responded to the report of social media, blaming his lack of popularity on personal attacks during the campaign.

"I note the review considered the relentless and unprecedented multi-million dollar political attacks on me by (Clive) Palmer and the Liberals successfully tarnished my public standing," Mr Shorten posted on Twitter.

"This is an important lesson for any future leader to confront."

What do you think was to blame for Labor’s election loss earlier this year?