People are creatures of habit, and they won t treat you much differently from the way they treat others in their lives. Watching someone, listening to them, examining how they deal with others helps to establish a foundation that the individual can be trusted. But all of that would be considered secondary research, at best. In order to experience the feeling of trusting someone, you must let down the barriers, in big steps, or small, and offer the trust. The risk is there, but the reward of trust is significant.
Any relationship is grounded on trust.
A relationship with God is no different. And in fact, the stakes are much higher. God offers us eternal salvation, a free gift when we accept the gift of His Son, Jesus Christ, and enter into a relationship with Him. And being in a relationship with God involves trusting God, and trust isn t something easily given. And for some of us, our father is not someone we trust.