Purpose of faith and logic... my guess would be ways of making decisions based on incomplete sets of information. It's how life works... we're never given all the data. So we make do with what we have. Faith, a system of values, is nothing more than an empirically derived set of rules that are passed down over generations which seems to work for most scenarios. Where as logic, a system of steps and procedures also established in the past, is deemed efficient in drawing conclusions by evaluating a limited set of information.
The two have more similarities than one imagines...
If you're interested in the conclusion, then no it does not matter. However, if you're interested in the process... then it does.If the means of arrival differ, but the destination is the same, dare I say then that the means do not matter as long as the method works?
A side thought: What is the purpose of philosophy? If you agree with the first statement, then can you say philosophy is of no value to you?