I'm a Catholic and despite not going to Church or 'expressing' my faith in the sense of adhering to a routine schedule of devout servitude, I still feel as if I maintain a connection with the deity. What you've stated above, I took to mean two things;
1) Is there hope for mankind without the existence of God but the belief in God?
2) Is there hope for mankind with/without the existence of God but no belief of a God?
Which is it you're asking?