I think he's talking about not being sure whether he is in fact saved, like God promised he would be. I think when he says "if i look up and the sky's not there" he's talking about judgement day, [revelation 20:11- Then I saw a great white throne and him who was seated on it. Earth and sky fled from his presence, and there was no place for them.] and how wonders if he should be scared because he doesnt have enough faith. he knows that God has promised to save him but he struggles with doubt and worries that this imperfect faith will not be enough when it comes down to it. The last couple of lines seem hopeful, although I don't really know what they mean. Maybe that so far God has been faithful?
I think he's talking about not being sure whether he is in fact saved, like God promised he would be. I think when he says "if i look up and the sky's not there" he's talking about judgement day, [revelation 20:11- Then I saw a great white throne and him who was seated on it. Earth and sky fled from his presence, and there was no place for them.] and how wonders if he should be scared because he doesnt have enough faith. he knows that God has promised to save him but he struggles with doubt and worries that this imperfect faith will not be enough when it comes down to it. The last couple of lines seem hopeful, although I don't really know what they mean. Maybe that so far God has been faithful?