MP Andrew Laming says the Coolnwynpin State School chaplain has been forced to walk away due to a state government delay in funding.
Mr Laming has issued an ultimatum to state MP Don Brown to top up the chaplaincy funding by the end of school holidays.
But Mr Brown has accused Mr Laming of trying to politicise the chaplaincy via petty political point scoring.
Mr Laming said Coolnwynpin decided to fund its own Chaplain "Chappy Jules" last year because the state government re-funding of positions was expected early in 2019.
Queensland deferred the application round to July, meaning the position could not be supported with fundraising alone.
Chaplaincy funding comes from the federal government, a program initiated by then first-term MP Mr Laming and three colleagues, with funds paid to states to manage.
Mr Brown said he had met with the Coolnwynpin deputy principal before Mr Laming's ultimatum.
"The deputy principal informed me that Andrew has already indicated funding the Chappie at their meeting ... last Friday," Mr Brown said.
"Andrew never mentioned my name nor a requirement for me for joint funding at that meeting.
"To pull the school into this petty political fight after he had already indicated he was paying for the Chappie shortfall is disgraceful.
"With this precedent set, I hope Andrew Laming picks up the shortfall in federal funding for all schools in the Redlands for Chappies."
Mr Laming said adding another term and up to $5000 to the fundraising task was a bridge too far for the community.
"That is why I am giving Don Brown two weeks for his government to provide interim funding or I will step in and underwrite the salary personally."
Mr Laming said Mr Brown had access to limitless amounts of union money.
"He is happy to purchase bikes for fetes, then he needs to contribute the salary for the term," he said..
"I will ensure Coolnwynpin has an application in for the July grant round, and they have my pledge that I will underwrite the salary if Mr Brown renegs."
Mr Laming has previously given State Health Minister Steven Miles an ultimatum on hospital funding which failed.
