Q: "Some kids at my school are saying God didn't make the world. I know they're wrong, but I don't know how to back up what I believe. Can you help?"
A: Sounds like those kids have forgotten their old Sunday School lessons. The Bible is pretty clear on God's existence and the beginning of time. In fact, there's a whole book devoted to the beginning of the world.
Genesis 1:1-2 says, "In the beginning, God created the heavens and the earth. Now the earth was formless and empty. Darkness was over the surface of the deep and the spirit of God was hovering over the waters." In the beginning...God. That's all there was. God wasn't created, made, or born. He just was always there. It's simple, really, but such a thing is hard for us to grasp.
John 1:1 tells us, "In the beginning was the Word [Jesus], and the Word was with God, and the Word was God."
Nehemiah 9:6 states, "You alone are the Lord. You made the Heavens, even the highest heavens, and all their starry host. The earth and all that is on it, the seas and all that is in them. You give life to everything and the multitudes of Heaven worship you."
There's also scientific evidence -- loads of it -- that prove that the Theory of Evolution is just that: a theory. Nothing more. It's a theory proved wrong, even, but people still refuse to believe that what they've been thinking for all these years is wrong. People are stubborn. Creation science is really cool. You should look into it. Visit the creation museum and research to find the facts. And, of course, have the Scripture to back up your claims.
Looking for a fun, hands-on book about creation science? Check out the book It Didn't Just Happen. It has mind-boggling information supporting God's creation of the world.