The sign for "believe" is a combination of the signs
THINK +
MARRY.
Memory aid:
The thoughts that you have married are your beliefs.
BELIEVE:


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Notes:
I do this sign with an index finger and then modified "C"
handshapes. But some (many) people start the sign with their
dominant hand in a loose "C" or "B"-handshape. I don't do that because I like to avoid
confusion with the sign for "HUSBAND."
I like to clearly show the "THINK" part of the sign by starting with a
"1"-handshape.
One way to convey the concept of "I will believe it when I see it" is to sign:
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Sample sentence: Do you believe in Santa Claus?
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Notes:
See: PROMISE
Notes: