I am one of those guys who was very religious at one time but am a moderate now. By religious, I mean accepting whatever is mentioned whether in the holy books or by a religious leader or by any authority on religion. But they realization struck one day that today's religion equals blind faith.
Blindly following what is mentioned in the books by mortal beings like us is an insult to God and his wisdom. God created us with intelligence. He didn't want us to be like animals guided by a stick. He gave us intelligence to think on our own. To use our intelligence and quest for knowledge to find the true meaning of God.
It was extremism in religion that puts me off about it. The world seems to suffer everyday because of religion: either directly or indirectly. It is when people take religion to extreme heights. Consider the terrorists who can kill others and themselves just to justify their religious misinterpretations. Consider the religions in India which cause more trouble with the minority status and stuff which instead of making a person a citizen of the country just ends up alienating people into various communities. Consider the destruction of temples, mosques and the mayhem that follows it whether it is for a good cause like development or a bad one like the Babri masjid demolition. Consider the Ram Sethu stuff which was used as a tool by the politicians.
My view is that a human cannot exist without God's guidance. But being spiritual and understanding one's purpose and meaning in this world is much better than indulging in blind adherence to practices, most of which harm others. God has given us a beautiful mind to understand him. Let's use it to learn how God works his magic through this beautiful world.