Tenet/belief- faith, trust, or confidence in someone or something
The picture represents the trust and faith they have in the object or person, to give them the best of something, or will impact them in a good way if they believe.
Monotheism- the doctrine or belief that there is only one god
The one God is the only one that the group of believers will believe in. If not in their doctrine that there is another God they won't believe in them.
Agnosticism- someone who thinks there is no knowing about the god or the creator of the world
Agnostics know nothing about the creation or if there is a god in the world. The questions marks indicate the missing or unknown knowledge they hold in their minds everyday.