All definitions courtesy Merriam-webster...
Leprechaun
"a mischievous elf of Irish folklore usuallybelieved to reveal the hiding place of treasure if caught"
Gnome
"an ageless and often deformed dwarf of folklore who lives in the earth and usuallyguards treasure"
Werewolf
"a person transformed into a wolf or capable of assuming a wolf's form"
God
"The supreme or ultimate reality"
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Notice how one of these words is defined as THE ESSENCE OF REALITY ITSELF.
If you say God, that is, The Ultimate Reality, doesn't exist.. you are holding a really stupid position.