Indeed, You are the Exalted in Might, the Wise.". وَمَن يَرۡغَبُ عَن مِّلَّةِ إِبۡرَٰهِـۧمَ إِلَّا مَن سَفِهَ. Read Surah Baqarah ("The Cow") which is the second chapter of the Quran. There's great barakah from reading this surah which contains Ayatul Kursi.
In al-Sahih, it is narrated from Abu Hurayrah that the Prophet (peace and blessings of Allah be upon him) said: "The most deserving of my intercession are those who say La ilaha illa-Allah sincerely from the heart or from the soul."