The question of why a deity, such as God, would wait billions of years to create life and then billions more years to create humans is a theological and philosophical one. It touches upon various religious and scientific perspectives, and different belief systems offer different explanations.
From a religious perspective, various interpretations exist. Some religious traditions view the universe and its unfolding as part of a divine plan, and the timeline of creation is seen as God's deliberate and purposeful design. They might argue that the vast timescale of creation reflects the majesty and grandeur of God's work and highlights the patience and wisdom inherent in the divine plan.
Others might take a metaphorical or allegorical approach to religious texts and creation stories, interpreting the timeline of creation as symbolic rather than literal. This allows for compatibility with scientific theories, such as the Big Bang and evolution, while still upholding a belief in God as the ultimate source of existence.
From a scientific perspective, the gradual emergence of life over billions of years is explained by the processes of evolution and the development of the universe following the Big Bang. These scientific theories do not involve the actions of a deity, but instead rely on natural processes and physical laws.
It's important to recognize that questions about the origin of life, the universe, and the role of a divine being in creation lie at the intersection of science, religion, and philosophy. Different individuals and cultures may hold diverse beliefs and interpretations, and discussions on this topic often involve a blend of faith, reason, and personal convictions.