My objection with your statement, is that you're oversimplifying the senses. Each one of our senses is confirmed by the other, to give us a reality that is hopefully as consistent as possible. It's not perfect, but who says it has to be perfect to gain insight into reality?
I would say that you cannot be "certain" of reality without perfection.
Though I am sure a lot of people are "pretty *** sure" and that is good enough for this material existence anyways
Now I know you are familiarized with the terms circular logic, and it doesn´t necesarily need to be only two elements to make it circular, it could be multiple elements.
Ironically, all "knowledge" is ultimately based on both faith and circular logic xD, because if there is an end to the "why"s when you ask yourself, whatever that is taken as a definite, is that on which you have faith (cause you don´t quesiotn it) and if there is no end to the "why" then every element of your logic depends on every other element of your logic, thus having effectively created a circular logic.
Our realities are unavoidably frail when one looks at it really honestly and logically. Our own senses(5 of them + 6th that is the mind(acording to buddhism, I think it´s a nice and fitting inclusion)) tell us clearly that absolutely everything could be bull.