The Calvinistic doctrine of Perseverance teaches that all believers will endure to the end in good works and fruit bearing. The idea that they will persevere is because the Holy Spirit will enable or direct them to continued fruit in their lives. This teaching is coupled with the doctrine of election which states that God has chosen the individuals who will be saved from before the foundation of the world and none of them will be lost, neither will any others be added to their numbers.
Assuming this to be true, what does it matter whether or not someone professes Christ but is indeed a "false convert"? If they were meant to be elect their salvation will indeed be genuine while those who were predestined to be damned will remain in the delusion of a "spurious" profession.
Ray Comfort states that 90% of professions are false. That may be the case in California and other parts of the US, BUT is hardly the case in nations where the Church is severely persecuted and mocked. What possible reason would a person have to pretend to trust Christ if they would risk their life for doing so? Why would anyone give up the comforts of life and pleasure unless they realized that a greater threat than physical death was imminent?
IF these doctrines are indeed true as many affirm, then what is the issue with haggling over requirements for salvation? The elect will get saved - end of story.
IF the number of the elect is already fixed and unchangeable, how should we as Christians be living and what should be our priorities in life?