Christians on the Left has said that the murder of Labour MP Jo Cox, coupled with the party's failure to convince voters to Remain in the EU and divisions over Jeremy Corbyn's position as leader are making it a very difficult few months for the party.
It has also called Christians to pray for them and the party rather than simply criticise it.
Angela Eagle (above) announced on Monday that she would stand against Mr Corbyn - who overwhelmingly lost a vote of no confidence - in a bid to save and unite the party.
Jeremy Corbyn (below) has said he will stand against any challenger and that he still has the support of a majority of Labour members - the people who selected him in the first place.
Ms Eagle has the backing of the 51 MPs needed for a formal challenge but it remains unclear whether Mr Corbyn will also have to secure the support of MPs in order to fight the leadership battle.
Speaking to Premier, Andy Flanagan from Christians on the Left said: "It's been a seriously tough time.
"If ever there's a time when people should understand and not be critiquing...you think of the death of Jo Cox, one of their close colleagues, who was killed; the challenges of so many of their own people being split in the Brexit vote; and then also the obvious challenges of a [leadership] campaign like this.
"The media want to describe it as division and I would call it disagreement...before we throw too many stones as Christians we should realise, there are a handful of political parties but there are over 450 denominations in the UK - so we're obviously not too good at working together either.
"I would call people to pray. We need a strong Government and a strong Opposition in this country."
Some say the Labour rulebook automatically allows leaders onto the ballot in a contest however others believe it says they need the backing of 51 MPs and MEPs like the other contenders do.
Labour's ruling body, the National Executive Committee, is expected to decide this week if Mr Corbyn needs backing from 51 of the party's politicians to stand in a new leadership contest.
Jeremy Corbyn has suggested he would consider suing the Labour Party if he was not automatically included on the ballot.
Listen to Premier's Aaron James speaking to Andy Flanagan:
