Aquinas would disagree, but that's neither here nor there. A faith that is based upon an infinite God with infinite power and infinite being cannot be subject to finite reason. You propose a contradiction - how can a loving God allow his creation to suffer terribly? But the infinite, being infinite, contains all contradictions. We simply "do not comprehend, being mortal, the concerns of the immortal." And there believers would have it. The most potent (I think) argument to be made is that something beyond reason, beyond logic, beyond observation and beyond human power, may as well be beyond our concern.