Infinite regression of skepticism
The common objection to the concept of skepticism is that one would have to be skeptical of skepticism, and skeptical of being skeptical of skepticism, and skeptical of being skeptical of being skeptical of ... - into an infinite regression. Since that would be impossible to achieve, skepticism is thus invalid. With skepticism invalidated, faith is therefore the only path left that could be valid, and the objector could be attempting to make a case for solipsism.
Two important aspects of skepticism and acceptance should be noted:
- The amount of skepticism is directly proportional to the outlandishness of the claim.
- Due to practical reasons, we tend to accept things that are demonstrated beyond a reasonable doubt. If a claim is 99.9% likely, one can go ahead and accept it, and be virtually guaranteed to be correct.
Thus, some claims require so little skepticism, we may as well accept them, because these claims are so normal that it'd actually require a burden of proof to demonstrate that they don't happen. For instance, if a person claims to have $1, it's pretty safe to take the person's word for it. If that same person claims to have $100 Billion, then he/she is going to need a lot of evidence to support the claim.
- I am skeptical that my files on my computer are in danger of being lost, if the hard drive dies, so I make a backup of the files.
- I am skeptical that my backup could be destroyed too, so I make a second backup, and place it in a firesafe.
- I am skeptical that my second backup could be stolen as my house burns down, so I make a third backup and store it in another building.
- I am skeptical that all three of my current backups, on magnetic drives, and susceptible to EMP blasts, so I make optical backups of all of them.
At some point, the files are so well protected that one is becoming paranoid. A normal person reaches a point where he/she realizes the files are safe, and there's no point to being additionally skeptical about their safety.
In summary, since skepticism is directly proportional to the unlikeliness of the claim, the regression of skepticism subsides to a point where it stops, fairly quickly.