Some interesting quotes on the subject from smart people.
If a child runs into the room saying "Mummy, mummy! I love Jesus and He loves me! We're all going to Heaven when we die and God is looking over us!", people will smile and praise the child. Nobody would say "Don't be silly. You can't possibly say that because you don't fully understand everything about the religion. How can you know that for sure, when you've not read the Bible in the original Hebrew?!?". But if a child (or teenager, or adult) says "I've had a good think about it, and have come to the conclusion that Jesus is a myth and nothing in Christianity makes much sense. I declare myself to be a freethinking secular humanist.", then they are quite likely to receive the latter response. You could have all the theological training of a hedgehog and still get wild applause if you stand up and say you're a Christian, but it seems that atheists are required to demonstrate more intelligence and Biblical expertise than all the clergymen and theologians that have ever lived before they are allowed to publicly express their doubts. -Adrian Barnett
Do not believe in anything simply because you have heard it. Do not believe in anything simply because it is spoken and rumored by many. Do not believe in anything simply because it is found written in your religious books. Do not believe in anything merely on the authority of your teachers and elders. Do not believe in traditions because they have been handed down for many generations. But after observation and analysis, when you find that anything agrees with reason and is conducive to the good and benefit of one and all, then accept it and live up to it. -Buddha
One of the great tragedies of mankind is that morality has been hijacked by religion. -Arthur C. Clarke
The most unbelievable social convention of the age in which we live is the one to the effect that all religious opinions should be respected, no matter how ignorant. -William Edelen
Shake off all fears of servile prejudices, under which weak minds are servilely crouched. Fix reason firmly in her seat, and call on her tribunal for every fact, every opinion. Question with boldness even the existence of a God, because, if there be one, he must more approve of the homage of reason than that of blind faith. -Thomas Jefferson
In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time someting like that happened in politics or religion. -Carl Sagan
The best minds will tell you that when a man has begotten a child he is morally bound to tenderly care for it, protect it from hurt, shield it from disease, clothe it, feed it, bear with its waywardness, lay no hand upon it save in kindness and for its own good, and never in any case inflict upon it a wanton cruelty. God's treatment of his earthly children, every day and every night, is the exact opposite of all that, yet those best minds warmly justify these crimes, condone them, excuse them, and indignantly refuse to regard them as crimes at all, when he commits them. -Mark Twain