Read the sentence part by part and check whether each segment stands correctly on its own.
Segment two, "everything will turn out", and segment three, "to be all right", together form a smooth verb structure with no fault. That leaves segment one to examine closely: "If you have faith in Almighty".
"Almighty" used as a title for God behaves like a proper noun that still needs the definite article, exactly like "the Sun" or "the President". The correct form is "faith in the Almighty", so leaving out "the" makes this segment ungrammatical.
Because the fault sits in the first segment, option A is the part with the error, and option D, "no error", cannot be correct.