- Not believing; incredulous; doubting; distrusting;
skeptical. - Believing the thing alleged no to be true;
disbelieving; especially, believing that Bible is not a divine
revelation, or that Christ was not a divine or a supernatural person.
Meaning of 'unbelieving' (Princeton's WordNet)
1 . unbelieving
[ s]
Meaning (1): - denying or questioning the tenets of especially a religion