I disagree. It's not our place to criticize other's beliefs. I have a respect for other's beliefs since I would want that for my own beliefs. For example, I don't criticize Buddha's alleged comment that there is no gods and if there are any they aren't going to help man. That statement is based upon his own personal observation and experience, so who am I to criticize it. I may disagree with it but I respect it. My God, Jehovah, offers everyone the choice of accepting or rejecting him. Either of those choices are granted by him, he doesn't force anyone's choice. So I respect either choice.
What I think is fair to criticize is the transmogrification, obfuscation, misrepresentation, or slander from willful ignorance of a belief. If someone says God, meaning a specific god, that of the Bible, for example, is something or did something which I think is false it's open for harsh criticism. If, for example, my statement above on Buddha's position on God were contrary to his actual position I would gladly accept criticism for having made the statement. If that criticism, in my opinion, from my own observation and experience, happened to be incorrect then I would protest it and feel obligated to explain it.
This is why I have such an animosity towards what I define as "militant" atheists. I believe their criticism to be, not only unfounded, but unfair, arrogant and disrespectful. That's what I react objectively opposed to. Not their rejection or disbelief, but their unfounded, unsupported, arrogant and unfair criticism.