I suppose that might depend on the particular religion in question, but in Christianity, no, the believer is not always right. The whole point of Christianity is that we were wrong, we sinned, and that sin separated us from God, which required Jesus Christ dying on the cross to bring us back into a relationship with God.
Islam accepts the Judaism and Christianity as true religions of God and respect them and their prophets (Moses and Jesus (peace on them)) and consider them religions from God but designed for their own time. Islam believes a true believer in God should always accept and follow the newest religion of God. because religions are deviated and changed during long history and when is needed God send new religion. islam believes a wise believer always should seek truth and find the best religions and should hear all voices and select the best.
This is known as the principle of complementarity.
The word 'Christian' is a noun, a singular, common, abstract noun; a word for a believer or follower of a Christian religion or Christian beliefs. The noun Christian is a proper noun, the name of a specific religion and is always capitalized.The word 'Christian' is also an adjective, a word that describes a noun; for example Christian religion or Christianbeliefs.
The principle of complementarity of structure and function.
Always has been, always will be !!
In physics and systems theory, the superposition principle, also known as ... principle holds (which is often but not always; see nonlinear optics), ...
always think of the goodness
a principle that is in effect always and everywhere.
religion should always be first.
It didn't. There has always been religion.
uniformitarianism
Electrons always enter to the lower orbit first,this is called auf bau principle.