The chain email said that over 200 years ago, the United States had declared war on Islam, and Thomas Jefferson led the charge! The Barbary powers were Muslim, and religion sometimes crops up in the historical record.
You need to use Form 1040X, along with a new Form 1040, plus any other necessary schedules and forms. Amended tax returns have to be mailed to the IRS on paper for manual processing. The IRS typically processes an amended return about 8 to 12 weeks, but this process can take longer during the IRS's busiest times.
After you file your taxes how long does it take to get your tax refund? How long does it take to get a tax refund e-file? How long did it take you to receive your tax refund check after it had been mailed?