Krsna Consciousness as a science doesn't require your belief, it requires you to conduct an experiment with yourself as the subject, to raise you up to the position in which you see.
I would agree to this in the sense, that to raise you up to the position in which you "see," requires indeed not so much only "believing" that there might be a God Supreme, this of course also, but rather move up to the understanding or awareness to be able to have indeed "faith" or rather be convinced about it, that the Supreme, is the One who is helping you in your life, and is also reciprocating with this your awareness and faith "in" Him.
Thats would I say, is my understanding regarding this interesting issue, which comes also from the experiences I made, in this my own relationship I had with Him, over the many years I was trying to make Him known in the country I was ingaged in doing this, in the last years, and also here in Germany in my own privat life.
Than indeed this "beeing of some service" for the Supreme Lord, which implys also to engage ones loving emotions for Him and others, (to live thus ones Love and loving emotions, as a convinced act of ones own, coming from the core of ones heart) who are also His parts and parcels, can become a wonderfull and most satisfying spiritual experience for the soul, at least it was and still is for me so. But that requires also complete freedom, to be convinced himself that he is engaged in doing that, coming from his own desire and heart to do it, and not just to be told by someone else, that one has to do it. Many are called but few are chosen or what is the saying? something like that. Or even a better approach to this would I say. Don´t just "believe" or be "convinced" so called of anything, unless it is, or is becoming "also true", to yourself.
Open up your mind and heart to new experiences of consciousness.