Itikadi ya Kiislamu imejengwa juu ya misingi imara ya fikra za kiakili. Muislamu amekatazwa kuwa na shaka yoyote katika imani yake, na aina yoyote ya kufuata bila kuchunguza katika masuala ya 'aqeedah imelaaniwa. Allah (SWT) anasema,

The Islamic creed is built upon the solid foundations of rational thought. The Muslim is forbidden from having any doubt in his or her belief, and any type of blind following in the matter of ‘aqeedah is condemned. Allah (swt) says,.

"Na inapoambiwa: 'Fuateni yale aliyoteremsha Mwenyezi Mungu,' husema: 'Bali tutafuata yale tuliyowakuta nayo baba zetu.' Hata kama baba zao hawakuwa na akili kabisa na hawakuwa katika uongofu!" {Al-Baqara 2:170}

“And when it is said to them : ‘Follow that which Allah has revealed,’ they say : ‘We follow that wherein we found our fathers.’ What! Even though their fathers were wholly unintelligent and devoid of guidance!” [TMQ 2:170].

Itikadi ya Kiislamu imejengwa juu ya akili. Kwa njia hii, inathibitisha hali halisi ya uwepo wetu badala ya kuikanusha kama wanavyofanya makafiri. Allah (SWT) anasema,