I see this all the time, and it's evidence that certain people don't get it. After all, they declare that all Christians at least accept such things, when none of their creeds mentions it.
Why is the notion that God must be all these omnis wrong?
Well, first of all, it isn't at Biblical. It's based on later writers of theology, some of which had half-baked logic or fawned over how powerful God must be. Nor do all Christians accept all of these.
Secondly, most of these are poorly understood, that is to say that people who say that God is omniscient only understand God as seeing everything in a single timeline and don't understand the notion of parallel universes and alternate timelines (seeing only a single timeline is hardly omniscient, and it shows the atheist bias towards fatalism), or omnipotent means able to do anything but somehow forces God to do things (God doesn't have the ability to make choices?) and also ignores the ability of God to limit or restrain God's own power.
Third, omnipresence is admitted among these (and actually it's the only one of these that has any merit), but rarely explained, as evidenced by repeated statements like "if God really exists, why can't I see him?" : facepalm: You can't see God precisely because God is omnipresent. And because you are trying not to see him.
And lastly, omnibenevolence is not even informally canon, like the other three. It's something atheists added on to stump theists on the problem of evil. But let's get back to omnipotence. Atheists somehow demand "If God is all powerful, and perfectly good, why doesn't he help good people (like meeeeeee)?" Well first of all, if you're testing God to perform miracles for you, you've already established you're not a good person, and suppose God threw you a bone and made a big flashy rainbow with no rain, you'd just raise your standards anyway. Second, you've defined good and all-powerful in a really weird way. Suppose we had a mighty king, and the king wanted to have his subjects be free, happy, and able to pursue their dreams. Would such a king spoil his people? On the contrary, this would make them willful, impotent, and fat/lazy. In the absence of any cruelty, such as king would encourage these people to rule themselves, and take responsibility.
Omnipotence without the ability to say no, is a very pale shadow of omnipotence.