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.
Taxpayers will typically see a status update within 24 hours after the IRS accepts your return or as long as four weeks after you mail in your tax forms.