[hota_mazi]

What matters is the amount of evidence to justify belief.

And no, belief and non belief are not two sides of the same coin.

Belief is a positive claim, that needs to be proven.

Not belief is just the rejection of such a claim, and doesn't require any supporting evidence.

Here is a quick example: imagine we walk in a park and I tell you that the number of grass blades in this lawn is even. Do you believe me?

Probably not.

Does that mean you think that the number is odd?

No. You're not making any claim. You are just rejecting my claim because I can't support it with evidence.

People with a non belief in god (atheists) are simply rejecting the claim that a god exists. It doesn't necessarily mean they imply that gods don't exist (some do, though, but that's a positive claim that requires evidence).