Some will say that miracles use up a great deal of spiritual power and simply can’t be done for everyone on a daily basis all over the planet.
Some will say that no, God has unlimited power and so it’s free will that prevents Him from coercing us to believe by showing us evidence.
Others might point out that miracles are transient and the effects are short-lived in the memory, and point to the permanent miracles around us, including our own incredible selves. How familiarity with existing visible miracles has led us to ignore what is right in front of us.
Miracles are necessary for belief, Jesus didn’t heal everyone, He performed miracles because they were necessary. If you don’t like that idea, then take away all miracles from the bible and see how convincing it is without them.
I have a strong belief. Firstly I believed in God from around four years of age. Then the world around me fascinated me and forced me to concentrate on the tangible, but I never stopped thinking about this pesky problem. So I prayed virtually all my life every night. Nothing much happened, some coincidences but nothing that would give me definate proof that God was real. I wrestled with the question for years and in the end I gave up wrestling because I thought I was dying. I was baptised and confirmed. Then God showed me a few things, tangible, not one or two but many. I asked for greater faith and He gave me greater faith by showing me that in one fraction of an instant He could change my life.
So, to summarise, I’d advocate suspend disbelief, pray with belief and keep God in your moment to moment life, ask for greater faith and then be aware. You might remember that God is a living God, real, our religion and our books are a best effort to understand, our religion serves God not the other way around. God is spirit, supernatural, not just a nice idea, real.