FAITH vs. LOGIC: Compatible or Contrary? Part One

It has been asserted by non-believers regarding God and the Bible that the Christian faith is illogical and that any who would adhere to such foolish beliefs is an unthinking, irrational person that cannot prove anything they believe, logically speaking. 

This begs the question, is logic something in opposition to, at variance with, adversarial in nature to faith? Are they, in a sense, polar opposites? Or is logic something that may be employed by the Christian or even one who is endeavoring to discover truth and is seeking out the validity of Christianity?