Is it logical to think that this earth came about through accidental evolution?
Before you start go outside and draw a picture (such as a person) in the dirt or use natural things like bark and pine needles to make a picture.
Take the kids on a walk. As you walk go past your drawing and act surprised that the wind would do such a thing. Insist that no person did this, that is happened all by itself. The kids will think you're being silly (which you are). Ask them how they can know that this picture was designed by someone.
1. Admit that you indeed did make the picture. Talk to the kids about how design requires a designer (God). Evolution is based on the idea that design can come about on its own if you give it enough time but reality tells us that when given enough time things fall apart not come together.
2. The design of nature all around us speaks loudly about the truth of Creation. Creation reveals God.
2 Peter 3:3-5 You have to choose to ignore the evidence of nature if you want to deny Creation or God.
Romans 1:20, 25 Nature reveals God but some people choose to forget God and worship nature instead.
Psalm 19:1-6 The sky talks about God's glory.
Genesis 1:1-2:3 How we got here.