Who created the world? A challenge to Jehovah's Witnesses

Who created the world? That seems like a simple enough question. God created the world.

In the beginning God created the heavens and the earth. Genesis 1:1

But there's more. The Bible also teaches that Jesus created the world.

All things were made through him, and without him was not anything made that was made. John 1:3

and

For by him all things were created, in heaven and on earth, visible and invisible, whether thrones or dominions or rulers or authorities—all things were created through him and for him. Colossians 1:16

How can it be that God created the world and Jesus created the world? (Now if you believe that Jesus is God, that's not so very difficult.) The solution proposed by the Watch Tower Society is this:

Jesus is the only one directly created by God. Jesus is also the only one whom God used when He created all other things. jw.org

Well, I could understand that. God made Jesus, and he made everything else, so effectively God made everything. But there's still one more verse I want us to look at.

Thus says Jehovah your Redeemer, who formed you from the womb: I am Jehovah who made all things, who alone stretched out the heavens, who spread out the earth by myself.  Isaiah 44:24

Jehovah claims that nobody helped him create the world. He did it by himself. But how can we reconcile this with the verses that clearly teach that Jesus did participate in creation? The only possibility is that the name Jehovah includes Jesus, that the one God whose name is Jehovah exists in three persons including both the Father and the Son. This is one of many reasons why biblical christians believe that Jesus was not created but has always existed as eternal God.