Sushumna application is the most important factor in spiritual practice. The moment sushumna is awakened, the mind longs to enter the inner world. When the flow of ida and pingala is directed toward sushumna, and distractions are thereby removed, meditation flows by itself.
Belief in God, and experiencing the presence of God at every moment, are two different things. Before the actual direct experience of the truth, one may believe in the existence of God, but that belief remains imperfect.
If you learn the technique of how to live here and now, then every moment will be filled with happiness.