Every culture and every tribe believes in something. Nations, tribes, and cultures that have never heard of Jesus believe in some god or something that can be considered as their god. Each has 'faith' in what they believe. Each has their own specific focus of worship, and each says they are right in what they accept as true.
There is, however, a difference between the ability to have faith, and what Christians call "The Faith." God has given all men a 'measure' of faith, but He does not say he gave everyone a measure of "The Faith." Neither does God say everyone will be saved because they show faith in something.
By Christians gaining a better understanding of the process and make up of their own faith, as well as faith in general, they can be better prepared for the spiritual battle being fought in the realm of faith. The more the Christian knows how his or her own beliefs function and grow, the better they can understand how misguided faith can be redirected to Jesus. With a clearer understanding of our own faith, we can present the evidence that God provides in truth and in the proper light.