Isn't a definition of religious 'faith' basically saying 'Well I believe it & that's good enough for me'?
'Well I believe* it & that's good enough for me'
* 'believe' does NOT mean 'know' unless you can say EXACTLY HOW you know (people ALWAYS seem to think these words are interchangeable for some reason -they are NOT!)
Why 'MUST'??? You've just admitted these things are NOT knowable so why MUST you decided ONE answer MUST be right then! It MAY be correct but MUST be? Why isn't 'MAY BE' a more sensible attitude?