You do not give your self enough credit, Freethinker. Of course you have the ability to believe things based on faith. Now, I am unsure of your domestic situation, but I am almost certain that you believe that your mother is in fact your mother. She was in the room giving birth to you and I am fairly certain there were no pictures taken or anything like that. You believe it without a single doubt. You might have a birth certificate and parental documents saying it but that does not amount to 100% rock-solid proof. Your mother saying “I gave birth to you” and living out her duty as a parent are more than enough evidence for you to believe it but it is not rock-solid proof. It is a truth that surpasses all reality for you (unless you do have bad domestic situations which I hope this is not the case).
I am sure you know for 100% certitude that Moscow exists on the map. (Or pick a city that you have never been to.) Maps, documents, witnesses, events, etc… These do not amount to 100% perfect proof, but we do have certitude that these things exist. These people and papers as evidence could just as easily be really really sneaky lies but that does not even cross our minds. Nobody needs the proof you are talking about. We would like it with certain things, like court cases, medical diagnoses and such, but it is not something we need it comes to believing things, yet we know without a doubt.
There are plenty of other examples that we take almost for granted every single day. The list is endless.
I am not saying for you to believe in God (although I certainly hope you go that route); I am just saying to give yourself more credit in your ability to believe things based purely on faith.
Take care buddy