One cannot be a cynic and a Catholic....

cyn·i·cal

  [sin-i-kuhl] 

adjective

1.

distrusting or disparaging the motives of others; like or characteristic of a cynic.

2.

showing contempt for accepted standards of honesty or morality by one's actions, especially byactions that exploit the scruples of others.

3.

bitterly or sneeringly distrustful, contemptuous, or pessimistic.

http://dictionary.reference.com/browse/cynical

And a sin, folks....based on slander, judgment, hatred, bitterness, or pessimism, all which are not Catholic virtues, and, indeed, are vices...