For a devotee or lover, the being, worshipped or loved, will always be the only one for her or him.
I have ended as a Reform Rabbi, grateful to Christianity for so many good things.
I recovered my infant Judaism, but in a reformist version.
During the Second World War, evacuated to non-Jewish households, I encountered Christianity at home and in school.
This Christian poison hasn't stopped yet.
At religious instruction classes, I encountered The Pilgrims Progress by John Bunyan, and the sincerity of the traveller in that book was overwhelming.