Mormonism is Correct

Simply believe otherwise

Appeal To Belief

Pretty self explanatory.

Creationism is a scientific doctrine

What observations can you cite that disprove the the claim that the world was created?

Fallacy Of Red Herring

None are required. This is also burden of proof fallacy - those that make the claim that the world was created need to provide positive evidence - in this context, a scientific justification. Even if previous arguer failed to provide evidence, that would not justify the original premise, "Creationism is a scientific doctrine."

Creationism is a scientific doctrine

By the same reasoning the claim the universe was not created must therefore also be non-scientific. So belief in creationism is no less rational than belief in naturalism.

Fallacy Of Red Herring

There are several fallacies in this sentence, first and foremost a red herring distracts from the original premise: "Creationism is a scientific doctrine." This was not a discussion about rationality, or metaphysical naturalism.