Thrush???
After checking for all possibilities at Adherents.com, the only religion beginning with a T and ending with an H seems to be "The Baha'i Faith" (it's official name).
Transformationalist
start
tantakententensiontendonteenthinthenthantintontalontokentoboggantreasontractiontrainteaspoontablespoontoxintaverntakentoughen
waistwaitwalletwarrantwasn'twartwentweren'twhatwheatwitwicketwombatwon'tworst
vacantvagrantvaliantvaletvariantvarmintvatvetvigilantviolentvomit
that toot
Internet is a word beginning with I and ending with T.
Tantamount = Equivalent to
Turtleneck...
Four letter word beginning with Z and ending with T:Zest
8 letter words beginning with B and ending with T: * backtalk * bankrupt * basement * besought * bookrest * bouffant * braggart * breakout