Its position is vastly different to the Catholic and Anglican churches, with the Anglican Archbishop of Sydney, Glenn Davies, warning the bill will "open the floodgates" to abortion on demand.
"I believe the defects of this bill are so serious that they cannot be remedied by minor amendments," Dr Davies wrote in a letter sent to MPs on Friday.
"The bill allows for an abortion well into the second trimester, namely 5½ months, for no reason other than the mother wants her pregnancy to end, and the life of her unborn child come to an end."
The Catholic Archbishop of Sydney, Anthony Fisher, has pleaded with Catholics to "pray, fast and urge MPs to reject the legislation", which he refers to as the "abortion-to-birth bill".
"A bill has been sprung on us in NSW Parliament...that's going to allow abortion right up to birth...you think of a newborn baby right up to birth," Mr Fisher said in a Facebook message.
But the head of the Uniting Church in NSW, Simon Hansford, said while "the sacredness of life" must be respected, "Christians are called to respond to life with compassion and generosity."
"The Uniting Church is disturbed that recent comments could imply that women make the decision to have an abortion without proper consideration," Mr Hansford said in an open letter to MPs.
