This thread is part of the Great Big Submission drive, and your letter to a theistic world should be posted here....

In the spirit of the new Sam Harris book, "Letter to a Christian Nation" write an essay imploring theists to leave their irrational beliefs behind. Example here

Your essay can be any length, although 2-5 pages is a good size. There are so many ways to tackle this, as there are so many flaws in theistic faith. Keep your arguments based on facts, evidence, and reason, we hold the intellectual highground, lets prove it.

Here is a thread that has some ideas on how one might write a good essay imploring theists to abandon theism. You might also want to read Atheist Manifesto by Sam Harris for some ideas. Your letter can be addressed to a Christian, Muslim, any specific type of theist, or theists in general. Unlike the letter to a friend you should not write this letter to a specific person, although you can revise your letter to make it fit the other category and submit two seperate letters.