Speaking, making Du`a' (supplication), or whispering to a stone is an act of Shirk (associating others with Allah in His Divinity or worship). Also offering a sacrifice or food to a stone is an act of Shirk. Going to the diviners and soothsayers and believing what they say about the Ghayb (the Unseen) are acts of Al-Shirk-ul-Akbar (major form of associating others in worship with Allah). A person who does any of this should give it up immediately and make Tawbah (repentance to Allah, Glory be to Him). They should have sincere belief in Tawhid (Oneness of Allah) and should not make Du`a' to or seek help from anyone other than Allah. They should hope for good from no one but Allah and believe that there is no refuge from Allah except in Him. They should regret all their past sins, so that Allah will forgive them all minor and major sins including Kufr (disbelief). Then, if after their Tawbah, they show strong faith and do good deeds, Allah will substitute their sins with good deeds, as Allah (Exalted be He) says at the end of Surah Al-Furqan, about the qualities of His good servants:
And those who invoke not any other ilâh (god) along with Allâh, nor kill such person as Allâh has forbidden, except for just cause, nor commit illegal sexual intercourse - and whoever does this shall receive the punishment.
The torment will be doubled to him on the Day of Resurrection, and he will abide therein in disgrace;
Except those who repent and believe (in Islâmic Monotheism), and do righteous deeds; for those, Allâh will change their sins into good deeds, and Allâh is Oft-Forgiving, Most Merciful.
(Part No. 1; Page No. 626) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.