No. Jehovah’s Witnesses do believe that God created everything. But we do not agree with creationism. Why not? Because a number of creationist ideas actually conflict with the Bible. Consider the following two examples:

Length of the six days of creation. Some creationists assert that the six days of creation were literal 24-hour days. But the word “day” in the Bible can refer to a considerable length of time.​—Genesis 2:4; Psalm 90:4. Age of the earth. Some creationists teach that the earth is just a few thousand years old. However, according to the Bible, the earth and the universe existed before the six days of creation. (Genesis 1:1) For that reason, Jehovah’s Witnesses have no objection to credible scientific research that indicates the earth may be billions of years old.

Although Jehovah’s Witnesses believe in creation, we are not antiscience. We believe that true science and the Bible are compatible.