A cognitive bias is a tendency for a mind to misinterpret information in particular situations. There are may types of cognitive biases. Religious belief may be largely explained in terms of human psychology, evolution and cognitive biases.
- "Atheism will always be a harder sell than religion [...] because a slew of cognitive traits predispose us to faith. "
An intuitive style of thinking has been found to predict more belief in God , as well as less skepticism.  Inducing people to think analytically temporarily reduces their religiosity.  Acceptance of dualism and, to a lesser extent, teleological thinking were found to predispose people to religious belief. 
Cognitive biases relevant to religious belief
- Confirmation bias
- Conformity Bias
- Agent detection bias
- What you see is all there is
- Overconfidence effect
- Dunning–Kruger effect
- Teleological thinking
- Dualism bias
- Humans are predisposed to believe in gods
- Boyer, P (2008) Religion: Bound to Believe?] Nature vol 455: 1038-39.
- Shenhav, Rand, and Greene (2012)
- Pennycook, Cheyne, Seli, Koehler, and Fugelsang (2012)
- Gervais and Norenzayan (2012), Shenhav et al. (2012)
- Aiyana K. Willard, Ara Norenzayan, Cognitive biases explain religious belief, paranormal belief, and belief in life’s purpose, Cognition, Volume 129, Issue 2, November 2013, Pages 379–391