Divine faith can be supported in its budding stages by reason. It can also be suppressed by it. Good logic leads to a disposition that attracts divine faith to descend, and faith picks up where logic leaves off. The shortcoming of logic in terms of its being a suitable vehicle for reaching conclusive truth is obvious. For every argument there is a counter argument.
Logic is inconclusive.
If we are to arrive at conclusive truth we must find another vehicle. Faith is that vehicle - divine faith. However, reason results in inconclusive knowing even within its own realm unless guided by faith. When guided by faith, reason leads to the certainty that enables one to engage in steady spiritual practice which allows one to know conclusively. In our daily life we should test the metal of our faith in God with the fire of reason.