<p>the only unreasonable view is atheism. for a person to be sure that something does not exist, they by definition will need to be aware of everything that does exist. since this is not possible, they reasonably cannot say that something does not exist. in other words, knowing with certainty that something does not exist requires first being aware of all things that do exist. at most they can be agnostics. </p>
<p>i recommend people reading the book “permission to believe” which has several such logical arguments and is quite convincing and got great reviews on amazon.</p>