I wish people would stop saying that they believe in something, because it is too imprecise and open to misinterpretation. The statement "I believe in peace" might mean "I believe that peace is possible" or "I believe that peace is preferable to conflict". Similarly, if someone says "I believe in [insert name of locally popular deity]" they might mean "I believe that [insert name of locally popular deity] exists" or "I believe that [insert name of locally popular deity] is omnipotent and omniscient" or "I believe that the teachings of [insert name of locally popular deity] gives guidance of how to live one's life."
What is needed is to replace "in" with "that" because it forces the explanation. The imprecise "I believe in love" would have to be explained as "I believe that one day I will find love" or "I believe that love makes a lot of people happy" or "I believe that being loved is the preferred state" etc.