Wiktionary
n. A distaste for Gods and religion.
Wikipedia
Theophobia is the condition where the Fear of God or deities results in extreme anxiety over the possibility of Divine Retribution as a result of perceived acts of sin, a religiously defined act of violating God's will. Like other phobias, theophobia negatively impacts the life of the sufferer.
A person who has been brought up under a strict religious environment may develop this kind of unexpected phobia. The person may not fear god directly, but scared of the wrath of the god if he/she does anything wrong according to the religion. A series of adverse events may interpreted by the believer as punishment by a deity, and the person may start believing that every distress has been caused by god, and starts dreading further punishment for everyday actions and beliefs.