Opposed; contradictory; inconsistent.
Opposite; in an opposite direction; in opposition; adverse.
Given to opposition; perverse; wayward.
Contrarily
One of a pair of propositions that cannot both be simultaneously true, though they may both be false.
The opposite.
Skeptical.
Someone who is skeptical towards religion.
Someone who doubts beliefs, claims, plans, etc that are accepted by others as true or appropriate, especially one who habitually does so.