Islamic
The Arabic word kafir (literally the one who "covers", usually translated as "disbeliever") is the Muslim term commonly translated into English as infidel.[12][13] In the Islamic doctrinal sense, the term refers to a person who does not recognize the one God (Allah) - atheists and polytheists - and not to religions such as Christianity, Judaism - who are seen as "People of the Book (Ahl-e-kitab)".[10][14][15]

Kafir, like infidel, has also come to be regarded as offensive,[16] thus some Muslim scholars discourage its use due to the Quran's command to use kind words.[17] It is even a punishable offense to use this term against a Jew or a Christian, under Islamic law.[16] Muslims today however do tend to use the term indiscriminately in reference to all non-Muslims.[10]

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I have received mixed reactions from gas station owners when I wear my infidel T shirt. A couple have laughed but most scowl.

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It's an FU to islamic supremacists.

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Thank you.  I knew I liked it, just wanted to be sure that it didn't conflict with my Christian views.

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It's embracing the enemy's invective and daring them to make an issue of it.