All praise be to Allaah Alone, and peace and blessings be upon the Last of the Prophets.
In its second edition, Al-Rayaa magazine published a message by the Islaamic Center in Geneva, including many inquiries starting with Eemaan (faith or belief), as many people are suffering from doubts and worries. Is it true? A reply came from brother Dr. Sa`eed Ramadaan, who said after praising Allaah: “It is well known that Allaah (Glorified and Exalted be He) innately created all humankind with belief in Him as the Lord, God and Controller of their affairs to be feared, beseeched for help, and approached through various acts of worship. Allaah (Exalted be He) said: So set you (O Muhammad صلى الله عليه وسلم) your face towards the religion (of pure Islaamic Monotheism) Haneef (worship none but Allaah Alone). Allaah’s Fitrah (i.e. Allaah’s Islaamic Monotheism) with which He has created mankind. In an authentic Hadeeth, the Prophet (peace be upon him) is reported to have said: Allaah states: I have created my servants naturally inclined to the Truth, but devils deceived them, led them astray from their religion, and commanded them to associate partners with Me for which I sent down no evidence.True Eemaan is to believe in Allaah, His angels, His Books, His messengers, the Last Day and divine decree in prosperity and adversity. This was the Prophet’s reply to Jibreel’s (Gabriel) question about Eemaan, which consists of more than seventy branches (i.e. parts), the highest of which is testifying that there is no god but Allaah and the lowest rank is removing harmful objects from the road. Eemaan also increases through obedience and decreases due to disobedience, as clearly pointed out in Aayaat (Qur’aanic verses), prophetic Hadeeths and the way followed by the Salaf (righteous predecessors). After this introduction and definition of Eemaan, we say that it is subject to worries and doubts for many reasons.
1- Ignorance about prerequisites and evidence of Eemaan.
2- Failure to apply what you know, and this gradually leads to weakness of Eemaan, until it totally vanishes and is replaced with doubts. This fact is supported by actual occurrences as well as Islaamic texts.
3- Being in an environment devoid of Eemaan, which feeds suspicion and doubt, thus leading to wavering Eemaan and weakness in the face of temptation and deviant impulses; especially if one is of little knowledge and does not have good companions who can help them remain steadfast. The Prophet (peace be upon him) stated: Hasten to perform (good) deeds before trials which are as dark as night, where one can be a believer in the morning and a disbeliever at night, or a believer at night and a disbeliever in the morning, who barters Eemaan for the perishable goods of this life... read more here.