We can't always identify with all the characteristics of God, like God's infinate presence, or God's timing, or even God's choice of who gets what and when...that makes God hard to understand and even harder to explain to people. The reality is though that God probably isn't asking us to prove His existance to people...
The folks in the Bible seemed more interested in helping folks to understand what God is like. Why? Because people get that. I may not be able to explain to someone exactly how God intervenes and God's motives fully, but I can tell people what God is like because I know what Jesus was like: compassionate, gentle, healing, generous gracious.
Our job isn't convincing people that God is real, like God is somewhere else. Rather it's our job to help folks see that they're already a part of God's family and to show them the parts of their uniqueness that reflects what God is like.
When we say Our Father, we are saying that God is everyone's father...even the people who are only spacially related to God.
That's some good news...
...at least I think so