I respect your desire to bring about change, but trust me on this: there is nothing you can say in the minute or two before the Elders swarm you and usher you out that will change anyone's mind. That's not how conversion and deconversion work.
Intrigue169, your 'sins forgiven' remark presumes that you come from a fundamentalist Christian background in which a person prays the 'sinner's prayer to get to heaven. Your theology doesn't translate into their theology, be aware of that. They do not believe their eternal destiny comes down to a 30 second mantra.