[KrisKrinkle]

“Is it professing faith if I say Man created Odin, or Man created Jupiter?”

Depends on whether or not you believe it and why you believe it.

In short:

Too often, atheists scorn those who have faith in God but are unable to prove God’s existence, while at the same time the atheists say there is no God but they can’t prove it.

An atheist’s unprovable belief that there is no God is a matter of faith on the part of the atheist which weakens their attack on others who believe something based on faith.

[MrB]

A true A-theist wouldn't express ANY opinion on the existance of God.

Only ANTI-theists feel that need. And in so doing, they are expressing their beliefs about God, ironically becoming theists, expressing a theology.

[GunRunner]

Depends on whether or not you believe it and why you believe it.

I don't believe in Odin or Jupiter; I regard them as creations of ancient mythology. Am I professing faith?

[Goldsborough]

It's always been my view that the burden of proof is on the proponent. Atheists have the luxury of not having to prove a negative. Since they don't believe in the supernatural, there is no requirement of them to disprove claimed religious phenomena.

As has been suggested already, true atheist don't care about what religionists claim to believe. Irreligionists are fanatics of disbelief who continually try to burn faith down. They are people who buy bus ads.