Well, sharing one's beliefs doesn't make one any more irrational than the many Atheists that share their disbelief.
...unless everyone sharing a belief or disbelief is irrational because it goes contrary to the other. lol
Irrationality is cognition, thinking, talking or acting without inclusion of rationality. It is more specifically described as an action or opinion given through inadequate use of reason, emotional distress, or cognitive deficiency. The term is used, usually pejoratively, to describe thinking and actions that are, or appear to be, less useful, or more illogical than other more rational alternatives.
Irrational behaviors of individuals include taking offense or becoming angry about a situation that has not yet occurred, expressing emotions exaggeratedly (such as crying hysterically), maintaining unrealistic expectations, engaging in irresponsible conduct such as problem intoxication, disorganization, or extravagance, and falling victim to confidence tricks. People with a mental illness like schizophrenia may exhibit irrational paranoia.
These more contemporary "normative conceptions" of what constitutes a manifestation of irrationality are difficult to demonstrate empirically because it is not clear by whose standards we are to judge the behavior rational or irrational.
http://en.wikipedia.org/wiki/Irrationality
Read the link. To me "religion" is definitely irrational.
religious faith may be seen as, in part, a rejection of complete rationalism about the world; this would be contested by some religious thinkers, in that the
rational is a debatable term.
Debating the term "rational" is interesting.
At the end of the day Religion requires blind faith in a book that is filled with the untestable.
I could sit here and tell you that God came to me in a vision and told me about Heaven and how it's got a Beer Volcano and a Stripper Factory. In Hell they have the same thing except that the beer is flat and the strippers have STD's. That's where sinners go who don't dress up as a Pirate on Fridays. God is all around us, touching us and guiding us, with his noodly appendage. God constantly tests our faith in him by planting fake evidence of "evolution" since clearly it was he who created everything.
Now if you're not aware of what I just wrote you're a heathen. May the Flying Spaghetti Monster have mercy on your soul.
This is just as valid as Christianity and the Bible (and don't think I'm picking on that one denomination since I could pick them all) and surely you can recognize that the Flying Spaghetti Monster story is irrational?
If not what about Frost Giants? What about us being immortal thetans from other planets who created the universe for fun and have to watch out for the souls of Xenu's people who are invisible and are here to do us harm? In case you're not sure who Xenu is, since you're not enlightened enough, you can look him up if you pay enough money since he's a very famous man. He was the Dictator of the Galactic Confederacy about 75 million years ago.