Gotcha . . . okay, most Faiths are founded on something which is 'felt' but not objectively real. These Faiths are indoctrinated into the person sometimes from birth, so there is usually no 'doubt' in the person as the Faith is perpetuated and confirmed over and over again as Truth.
On the Western Left Hand Path, we have Faith as well however, it is based on a deep connection with our Greater Self/Psyche/Soul/GodSelf. At first glance, it could be said that we too have no objective evidence for our faith in a Greate Self, yet this is wrong to assume. We all have moments where we excel beyond our human form and attain the act of Creation, mostly in the Arts. This is Us becoming consciously aware of our Greater Self, the Perfected Self, It shows Itself to us through these creative acts. Any act that is more than human is a glimpse of this Self.
Adherents of the Western Left Hand Path embrace these moments, seek them out further, harness them, and attempt to bring our Greater Self/GodSelf further into our mundane existence.
This process is very different than relying on religious hearsay and not questioning a religion's point of Faith as it is directly perceived and experienced.