Keeping in mind that the thought exercise has limited isomorphism to belief in God. No one believes in an invisible dragon in their garage … because there isn’t any reason to think there is a dragon there. Theists have reasons to believe in God, atheists just don’t agree with those reasons.
The question would have an answer for some actual believer in belief—not for a hypothetical character in a thought exercise.
Keeping in mind that the thought exercise has limited isomorphism to belief in God. No one believes in an invisible dragon in their garage … because there isn’t any reason to think there is a dragon there. Theists have reasons to believe in God, atheists just don’t agree with those reasons.