That's a big question that people have pondered for centuries! Since the concept of God is different for everyone, there's no single answer.
Some believe God is constantly planning and guiding the universe, involved in every detail. Others think of God as a more distant observer, setting things in motion but not actively interfering. Still others see God as a force or energy, rather than a being with thoughts.
Ultimately, what God is "thinking" is a matter of personal faith and interpretation.