Islam secures consistency and rationality of belief through its logicality and rationality. Islam is embraced strongly by its followers. Islam keeps the Muslim away from ideological confusion, because it has no illogical or irrational principles, rather they are consistent with one another.
It is narrated that one of the companions of the Prophet (pbuh) once asked the Prophet: 'Prophet of God, give me a comprehensive directive of Islam, after which I need not ask any one else about it'. The Prophet replied: 'Say: I believe in the One God and then remain steadfast on it'.
In fact, the message of Islam, is so simple, that even a bedouin nomad could understand. Whereas, christianity is so nonsensical, that no christian understands it, not even Drs in theology.
For more detail, see [Islam & Rationality ]