Just whip out John chapter 3 and ask them how they think thier going to ever see the kingdom when Jesus says only those born again will? Then read 15 where he says that every one that believes in him has life and ask them why they call Jesus a liar because they teach that only jws will have life?
Then if they still wish to proceed ask them if they believe the writer of second Timothy was inspired , when they say yes turn to 1timothy 2 starting in verse 5 where it says Jesus was the mediator for all mankind and the read on to show he was the ransom for all as well. Then ask , since your leaders say Jesus is only the mediator and ransomed for just them but the bible says all mankind , they must be liars again right?