In the interview with Harper's Bazaar, Madonna said:
I am building schools for girls in Islamic countries and studying the Qur'an. I think it is important to study all the holy books. As my friend Yaman always tells me, a good Muslim is a good Jew, and a good Jew is a good Christian, and so forth.
Well, the news doesn't mean that Madonna is converted to Islam. But she is building schools for girls in Islamic countries and studying the Qur'an along with all the holy books. Maybe she is trying to search for the truth.
The interview also quoted in Al Arabiya and the Gulf News
Just Like a Prayer? Madonna reveals she is studying the Quran
Madonna ‘studying the Qur’an’