The cost of theist religious belief is high. To properly engage with it involves joining a community that is totally subservient to a universal dictator. You need to accept faith in God on extremely questionable evidence and the associated statements about the nature of reality sometimes run contrary to available evidence.
Alethian Worldview (on freethoughtblogs.com) describes the cost:
“Religion encourages people to isolate themselves from reality, and to vote for leaders on the basis of beliefs that have been rendered impervious to fact and to reason.”
A significant cost is the loss of freedom. You sign up to be a slave and agree to worship an authority who can never be questioned and who subjects you to total surveillance from the moment of your birth, throughout your life and even after your death. It is the epitome of totalitarianism.
The late Christopher Hitchens likened religion to a celestial North Korea, but where, he quips: “… at least in North Korea you can f***ing die and leave.” No such escape awaits us with God.
Another price to pay for religion is the isolation from reality. The religious automatically form a ‘specific set of beliefs’ cohort group from which everybody else is excluded. Outsiders are automatically condemned to whatever Hell the particular religion subscribes to. There is no appeal or any arguments for the Defence, since ‘Church’ members’ beliefs cannot be challenged rationally. Most religious apologists think that the faithful have a right not to be seriously challenged anyway.
“What worries me about religion is that it teaches people to be satisfied with not understanding.” (Richard Dawkins)