The Brainliest Answer!
ang relihiyon ng mga Amerikano ay christianity
dahil sila ang nagturo sa atin ng christianity
sila ang nag introduce sa atin ng christianity 
so i guess that their relihiyon is CHRISTIANITY

actually people can choose which religion they want
people in america are just same here in the philippines
they choose their own religion 
there are some that are Protestan, evangelical, catholics 
so there is no main religion in America
cause i know some americans are catholics but mostly i know are Born Again Christians
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