Why did God create the universe, but only the Earth was inhabited? And God only cares for one planet?

There is basically no basis for the assumption that God only created one inhabitable planet. Also, to avoid confusion, have you ever heard the term “multiverse”? Our universe is but one of many, possibly infinite, universes, and to think that, or presume that ours is the only one, would be to unnecessarily limit God. Also to complicate matters, you are thinking in one dimension when we should remember that God is Spirit.

John 4:23-24 NIrV - “But a new time is coming. In fact, it is already here. True worshipers will worship the Father in the Spirit and in truth. They are the kind of worshipers the Father is looking for. [24] God is spirit. His worshipers must worship him in the Spirit and in truth.”

It is only Human to think only about what is right in front of us and from a physical sense but God is Spirit and dwells within the Spiritual realm and thus we don’t know how many other realms that we can’t even comprehend, exist? “The Universe” or our universe is but one of countless universes in our own physical realm and with the Bible/scriptures remaining silent about many things we should not limit God’s abilities and just be in wonder that God has created US (mankind) special and even more that God provided for us Salvation through Christ blood sacrifice freeing us from the burden and judgement of sin and our sin nature.

Genesis 1:26-27 NIrV - Then God said, “Let us make human beings so that they are like us. Let them rule over the fish in the seas and the birds in the sky. Let them rule over the livestock and all the wild animals. And let them rule over all the creatures that move along the ground.” [27] So God created human beings in his own likeness. He created them to be like himself. He created them as male and female.

Lastly, let’s also not assume that ours is the only potential life form that God created and that God only provided for Earth. All planets are kept secure and constrained within our solar system and provided for by our Sun (our own star). There is so much that mankind cannot even conceive of or even understand about what we have today, we just have to accept on faith the things that we cannot understand and conceive of. Faith that God is in control and has provided for us what we need and has provided for us and considered us special enough to have a personal relationship with our creator/God.