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…the state department lists are incomplete as they don't list all terrorist groups, only those originating outside of the country.

In America there are the Christian terrorist groups, just a couple of examples,  the Army of God, and the Phineas Priesthood,  

Then you have other terrorist groups like the Jewish Defense league, and the KKK and the Sovereign Citizens.

And this is by no means a complete list.

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(and 44 is not even 90% of 50, that would be 45, …so the 99.99% figure you're so fond of quoting still needs work.)
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Hyperbole is just that.  Overblown,  like some people's unwarranted fear mongering.
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There's no dismissing the Dylan Roof's, the Eric Rudolphs or the Alexandre Bissonnettes.

No one religion corners the market in terrorism.