agnostic

In matters of the intellect do not pretend that conclusions are certain which are not demonstrated or demonstrable. That I take to be the agnostic faith, which if a man keep whole and undefiled, he shall not be ashamed to look the universe in the face, whatever the future may have in store for him.

She left the church when she became agnostic.

The socket communications layer is agnostic with regard to its underlying transport mechanism—it is “transport-agnostic”.

I'm agnostic on whether ethanol is a green fuel.