mark wrote:
You can quote any scripture you like, until you're blue in the face.  But it takes an act of God to change a person's heart.
Not according to G-d!  G-d tells us these are tests to see if people will follow false gods or stay true only to HIM.    The statement that "You can quote any scripture you like, until you're blue in the face." speaks volumes.  
In Deuteronomy 13:1-2 the Bible raises the question of what to do when a "prophet" offers to show a miracle in order to lend credibility to his message. How are we to respond if, in fact, the promised miracle comes to pass just as he predicted? Should we then follow this "prophet" even if he encourages us to worship other gods which are unknown to our people? "You must not listen to the words of that prophet or dreamer," the Torah emphatically declares. G-d did not send him.

The obvious question is: Why would the Almighty permit religions and prophets who teach unsavory doctrines to produce spiritual transformations and miraculous events? The answer lies in the verses that follow.
The L-rd your G-d is testing you to find out whether you love Him with all your heart and with all your soul. It is the L-rd your G-d you must follow, and Him you must revere. Keep His commands and obey Him; serve Him and hold fast to Him. (Deuteronomy 13:3-4)
G-d warns us to ignore our "spiritual experiences" because he uses false gods and false emotions to see if we can be swayed from Him.  Yet still Christians in this very forum when shown the words of G-d refuse to listen to them.

Perhaps there is among you a man, woman, family, or tribe, whose heart strays this day from HaShem, our G-d, to go and worship the deities of those nations. Perhaps there is among you a root that produces hemlock and wormwood.

18. And it will be, when he [such a person] hears the words of this oath, that he will bless himself in his heart, saying, "I will have peace, even if I follow my heart's desires,". . .  Deuteronomy 29:17

If you follow your own spiritual experience. . .  what does G-d then say?

19. HaShem will not be willing to forgive him; rather, then, HaShem's fury and His zeal will fume against that man, and the entire curse written in this book will rest upon him, and HaShem will obliterate his name from beneath the heavens.

20. And HaShem will separate him for evil
"You can quote any scripture you like, until you're blue in the face."

Hopefully someone will listen to the words of G-d.

סופי

And everything that Sarah tells you, listen to her voice. Bereshit (Genesis) 21:12