One prime example of this is the individual who smugly dismisses religious faith as irrational. The presumption seems to be that folks who believe in God must be gullible fools, lacking either the intellectual competence or the honesty to question the tenets of their faith, who blindly cling to the comforts of religion. The pathetic irony is that the reverse appears to be the case. At least, I have yet to hear an avowed atheist present a rational argument for his lack of faith.
Most of the supposed arguments for unbelief end up being little more than contrived diatribes. Some priest or minister or devout Christian was guilty of such and such scandalous behavior. Or the stereotypically distorted versions of the Inquisition or Crusades are presented as somehow proving the insincerity or hypocrisy of believers. Never mind that these are ad hominem arguments. Never mind that the facts are usually distorted beyond recognition. Never mind that authentic Christians invariably admit their own sinfulness, and the sinfulness of their Church. What is perplexing is how anyone can jump from the problem of human sinfulness to an atheist conclusion, as if God's existence depended upon man's perfection. Huh?
Another tack is that of science; it is suggested that scientific advances have made religion obsolete. The mysteries that in the past confounded man and made him turn to religion are now within our grasp; we have only to discover via the scientific method that which we still do not understand. But this is also childishly simplistic, and wholly unscientific. Science can only concern itself with empirical data, with the observable traits of matter and energy. Science can never address such non-material realities as love, truth, or beauty. It is obviously beyond the competence of science to either prove or disprove the existence of God.
On and on it goes. Turns out, atheism appears to be the fragile and irrational system, depending upon blind, unthinking adherence. If there is an atheist out there who can present a cogent syllogism for his system of thought, I would love to hear it, I really would. If I could convince myself that God was just the invention of humans, life would become much more convenient. I could make up my own rules, readily justify my own behavior, and, best of all, condescendingly pity those poor foolish believers. Trouble is (sigh!), the sheer illogic of this idea stops me every time.