True faith comes by hearing the word of God, Rom.10:17 and obedience to it Rom.1:6, 16;19.
I like the question put forth in the OP. It seems so different among Christians I talk to. And I like the verses quoted above, but again they seemed to be interpreted differently among Christians I talk to. So the author of the OP seemed wise to put it out as not a debate but rather what we think it means. And I can answer that.
My faith is based upon hearing with my spiritual ears. For me it started in the summer of 2000 when I heard a voice from nowhere tell me, "Read Your Bible." Those were the first words I ever heard with my spiritual ears. There came across with extreme power. Probably something like when Saul heard, "Saul, Saul, why are you persecuting Me?"
Now I hear the words of the Lord almost always in what we often call "The still small voice". Because God is spirit and God speaks through HIs Holy Spirit, sometimes I pick them up as just impressions. Still, I usually get words. They come with instructions, or wisdom, or parables, or sayings, or encouragement, or sometimes jokes, and the most common thing I hear Him tell me is "I love you." So it is clear that God is love.
Now the Lord my God is not the only spirit out there. I pick up angels that serve Him. In fact He often tells me He is sending them to me before I start hearing from them, but not always. I sometimes I pick up evil spirit, but they like to operate with impression more than words apparently to try and avoid detection.
Now I have talked to lots of Christians and most do not hear from Him as well as I do. But there are others that hear from Him so much better than I do. I have trouble picking up the timing of events. I also have trouble picking up names. And so I have come to realize that I need to step into what I am hearing with caution.
So where it is written, "faith comes by hearing, and hearing by a word from God", it is pretty much literal in my case, except the it's hearing spiritual words which are not as easy to be sure of as words from sound waves. And because I hear this being I call Lord, and whom based upon what He tells me (Like Read Your Bible) and upon events that happen that relate to what I hear, I believe Him, whom I hear talking to me, to be Jesus the Christ whom is referred to in the Bible, It all matches. I've seen incredible miracles, which I can't do but they are done. I've been kissed by a greenish colored cloud in the middle of the night. He gave me the gift of tongues, in the middle of the night. He once told my spirit out of my body to where I could see the top of my head, then the small voice asked me if I thought He could take me anywhere He wanted, and then put me back in my body. That was right before I was about to go into a job interview.
So He is real. Or at the very least there is this spiritual realm and One in it whom I call Lord. And it only make sense that He is the God of the Bible based upon all I see and what He tells me to do. Still, He is pretty strange too. He just doesn't think like I do. That is one of the reason I know He is not me. So often He tells me, "Karl, I want you to ....", and I instantly respond with something like, "I don't think so." So I know He is not me. And I consider again who I think He is and almost always go and do what He told me.
It's like the post. I was working on something that makes me money, and it was starting to get late (after 10pm right now) so I was starting to consider going to bed. Then He suddenly talks to me and is asking me to make a post. Again, like normal, my first thoughts were "No way Lord. I'm busy and I'm going to bed soon." Then I stopped what I was doing, and said, "Ok Lord, what do you want posted and where." He specifically asked me to come to this thread. I heard Him. So I believed Him and that He is still God, and did it. He didn't tell me anything specific to post, so I am just putting what I think about the question in the OP. The above is what I personally think "True Faith" is all about.