'Hate' is a bit of a misnomer - and opens up the inevitable strawman flingin' of "hurr, hypocritical intolerant atheist lol" and the strawman counterfling of "hurr, mindless superstitious dummy lol".
I'll try to compress my aversion to religions and any non-rationalist ideology in several relatively concise and coherent points.
Too many mutually exclusive and inconsistent religions out there
Lets not try and fall into the eurocentric trap of assuming that Judeo-Christianity is the end all and be all of religion. There are many many religions out there, ranging from nature spirit worship, ancestor worship, monotheism, and the bizarre overly human pantheon of the Greeks and Romans. All of these, especially the monotheistic ones, carry the implication that that particular mode of religion is the 'correct' one, and everything else is incorrect. Unlike, say, the difference between the Earth is a sphere or a flat surface, or that water boils at 1 atm and 373K, these various belief systems all rely on unquantifiable metaphysics, and is therefore utterly dependent on human beings. My understanding of human nature is such that we are way too fickle to and mentally unstable to ever have a consistent way of understanding the world using any metaphysical construct, and hence religions all religions may as well be ranked on the same level using such a qualifier.
Note that I am opening myself up to the inevitable argument that 'science' is a mode of belief just like all those religions I am abusing. This is incorrect - science is a technique, and does not rely on the same wishy-washy reasoning that metaphysics rely on. Your point is hence bogus.
The persecution complex
I will be the first to admit it - atheist (strictly speaking I'm agnostic, but I'm leaning more on the atheist end) will happily indulge in persecution complexes. Whether they are real or imaginary is irrelevant - it is safer to blame a lack of progress on the malice of others than your own merits. Christianity, on the other hand, takes the cake with the persecution complex. Christianity was born in persecution - the fish and 666 all originate from the Roman Emperors feeding the Christians to the lions. Now that people who define themselves as 'Christians' currently make up the largest portion of the world's population, this attitude is rendered moot. Despite this, Christians, in my personal experience, will happily harp on about how their political and moral attitudes are not being met by the community at large, despite being one of the larger communities out there.
Note that I just fell into the trap I mentioned in the preceding paragraph. Silly me.
How it is unreasonable to take anything religious literally, yet this is presented as the only option
Yet again, I speak on Christianity, simply because it is the one I have had the most experience and understanding with. Little of anything in the Bible can be interpreted as anything but a metaphor. From the springing of human consciousness and free will from a state of blissful stupidity, to the 7 days creation thing, trying to interpret these things literally will simply lead you into a logical dead end and drive those who cannot subordinate their minds to pure faith away. The solution to this is to 'cherrypick', that is, use only the bits which are socially relevant and ethically sound. For some reason or another, this is taken as the worst kind of sacrilege amongst many religious types. Of course, this is probably due to prior experience with fundementalists, but what do I know?
I would also like to address a couple of other points brought up earlier:
Church and State make for poor bedfellows
Let us go back to the original definition of Politics. It is, simply, the acquisition, and retention of power. I make a rather sweeping definition, but I find it both relevant and consistent. Politics exists everywhere, it is an undeniable part of human nature. Get 3 people together, and there will be someone leading, and someone following. Therefore, even in a theocracy, where everything is suborned to divine intervention, there will be plenty politiking within it. A point of having a theocracy is suborning all decisions to the divine will of god, which leaves little room for (rational) political discourse. This suppression of politics underground tends to manifest itself in (democratically) unsavoury ways, from witchhunts to painful inquisitions. This phenomena will happily manifest itself in societies where the political system stops being benign, and a superficial show of unity is expected (case in point: Communist Russia). This leads me onto my next point...
Communism and Nationalism supplanting and substituting more 'traditional' religions
It is an extremely strong argument that Communism and Nazism were political efforts to replace traditional icons of worship with more...physical forms. This distinction is particularly evident in Stalinist Russia, with hymms to Father Iosef Stalin being sung in praise of him bringing the sun up (sadly, I lack a source besides my trusty Modern History teacher). This is why Cheesman's obsession with how the darstardly atheists have killed more people than the Christians is one of the most retarded things I have ever read. Which brings me to yet another point...
If they do something sane human beings find morally repugnant, they are not on my side, even if they say they are and did it in the same name as me
I love how Robbie and Cheesman brush off human beings being assholes to other human beings as being a sole symptom of atheism.
So, there we have it folks. Thank the good lord that it's Sunday tomorrow, so that I can sleep in. Note that my post has been steadily getting more incomprehensible, as a function of distance down the page. Thank you, and Good Night!