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What is the difference between creed and credo?

When I look up for credo in a dictionary, it says "a creed"

So what is the difference? Are they the same? If so, why they have two different forms?

Please help, thanks in advance.
Comments 
One is Latin (credo = I believe) and the other is English.
Oooh, I see.
Thanks!
credo-personal belief
creed religious belief