Helping a Friend about the Nature of Science

This, of course, solves the problem of your relationship. It maybe that for your case is the most sensible approach. I, nevertheless, will venture an advice, since me being a theist evolutionist, can help to assist your friend.
There is a very good Wiki article on scientific method, explaining its history and "evolution"(History of scientific method - Wikipedia)After an attentive reading you arrive to these conclusions:- The method that has been more instrumental for science advance has been the experimental-inductive, based in experimentation.- Deductive method has worked, but only if based on knowledge gained through inductive method.- Mathematics has been a very potent tool to organize reasoning.- Though many of the great scientists that helped develop scientific method were theists, none used the Bible or any sacred text as foundation for science.

I can not put it better than Crashfrog, only will add a quotation from Karl Popper, that goes in the same direction: "Scientific theories are neither true, nor false, they are approximations to truth"Edited by straightree, : substitution of wrong by false