Many find it hard to have a belief in something which has no tactical or visual proof. But faith brings purpose to many whom, having not seen, still believe in God. The Bible says in I Peter 1:8 "Though you have not seen him, you love him; and even though you do not see him now, you believe in him and are filled with an inexpressible and glorious joy." True faith really does fill your heart with a joy you cannot communicate in any language.
Back in Bible times believing in God would mean you would be executed, yet Jesus’ true followers would not deny Him. They had seen the Messiah and knew that He held the power of life and death in His own hands.
People that have Faith do not believe in coincidences. They believe that God works all things together for the good of those that love Him. What do people who have no faith do when disasters happen and their hearts get broken? Without faith it would be easy to feel like a victim of circumstances and to concede with King Solomon as he viewed life, apart from God, saying Meaningless, meaningless, all is meaningless.
Faith in a God you cannot see may be a concept hard to grasp. But that doesn't mean it is not very real. It’s like believing in the air you breathe in and are are surrounded by. Although you cannot see faith or the air you breathe, you still believe because you see the manifestations. The manifestations of an extrodinarily intellegent creator, like the air, are all around us and creation sings of His glorious presence.
Belief in God and in an afterlife gives people hope and motivates them to live life on purpose with a purpose.