0 0 ▁Greek ▁Orth odox , ▁ 5 5 0 , 0 0 0 ▁Pent ec ost als ▁and ▁Evangel ists ▁( 0 . 8 % ), ▁of ▁whom ▁ 4 0 0 , 0 0 0 ▁are ▁members ▁of ▁the ▁Ass emb lies ▁of ▁God , ▁about ▁ 2 5 0 , 0 0 0 ▁are ▁Je hov ah ' s ▁Wit ness es ▁( 0 . 4 % ), ▁ 3 0 , 0 0 0 ▁Wald ens ians , ▁ 2 5 , 0 0 0 ▁Se vent h - day ▁Advent ists , ▁ 2 2 , 0 0 0 ▁M orm ons , ▁ 1 5 , 0 0 0 ▁Bapt ists ▁( plus ▁some ▁ 5 , 0 0 0 ▁Free ▁Bapt ists ), ▁ 7 , 0 0 0 ▁Luther ans , ▁ 4 , 0 0 0 ▁Method ists ▁( aff ili ated ▁with ▁the ▁Wald ens ian ▁Church ). ▁ ▁Other ▁relig ions ▁The ▁longest - est ab lished ▁religious ▁faith ▁in ▁Italy ▁is ▁J uda ism , ▁Jews ▁having ▁been ▁present ▁in ▁An cient ▁Rome ▁before ▁the ▁birth ▁of ▁Christ . ▁Italy ▁has ▁seen ▁many ▁influ ential ▁Italian - J ew s , ▁such ▁as ▁Luigi ▁Lu zz atti , ▁who ▁took ▁office ▁in ▁ 1 9 1 0 , ▁Ern esto ▁Nathan ▁served ▁as ▁mayor ▁of ▁Rome ▁from ▁ 1 9 0 7 ▁to ▁ 1 9 1 3 ▁and ▁Sh abb eth ai ▁D onn olo ▁( d ied ▁ 9