Some people were raised with faith and have always had a strong belief in God. Some believers can fall away from God. Some have never had faith. In this world it’s easy to not believe.
So how can you get to God?
1) We aren’t just here. No matter what you think, aliens, big bang, other dimensions. It had to be created. The ancient Greeks knew this (the unmoved mover)
2) The creator must have created everything. And I mean everything. God would be sovreign and in control of all things.
3) It’s rational to believe the creator would want to give us a manual that tells us who he is and why we are here and how we should live our lives. Being God he can definitely control a book being produced and it’s form or forms in his creation.
3 steps is all it can take. There are numerous other ways to get there but I’ll put this one out there for now.