I was just wondering what religion you were talking about that promoted hate.
You know what. Screw it. I was trying to write a big long specific rebuttal, but I could not find any groups of people that were more then something like 5% Buddhist. I can't make a comparison between them because there is nothing to use as the Buddhist side of it.
Anyway, instead of a in-depth comparison I am just going to leave you with what were going to be my closing thoughts on it.
If you are using a a seven (or two depending on what part you read) thousand year book to build your arguments, how are you any better then the fundamentalist bible thumpers that you seem to think all Christians are?
I don't think any religion will deliberately promote hate as a goal, its not the major functions of religions. It may indirectly causing pain, hence leading to hatreds, like worshiping a god for war attributes. Even that's true, it will still stand on a moral high ground for the people who believe in it. And most likely the need of War God, is due to repression, invasion, or internal conflicts. It's introduced to solving problems, not provoking more. Although it may causing more in the long run, when no one foreseen it at first. And you might think I am refer to like Yahweh, and its role in the history, but no, let see what's happening on the other side of the world.
You may think in Buddhist religion you won't find a deities of war (not technically war itself, but the form of martial art/weaponry use/brotherhood the quality you need to survived as 武神), but it does. However its not the Buddhism of Buddha, but Buddhism affected by Taoism, and folk religions. Its not the "pure" Buddhist ideology, but the practice of Buddhism in general public. Deities in Buddhism are presented as someone(something) who have joined the Buddhism, and getting his/her/its way to enlightenment (A vajra you may say). People will pray to them, as if in folk religions. (So technically, we are talking about folk religions) And both in Buddhism (folk) and Taoism (folk), we have the famous God of War - Guan Yu (關羽), or by his deity title as "Saint Guan the governor of deities" (關聖帝君). (Again not specific for war)
And since Guan Yu is a real historical figure, who lived in 3rd century AD, when China is divided and raging with wars (three kingdoms period and many may know him from war simulation games like ROTK or Dynasty Warrior series), and he was a war hero/general, and view as "God in the battlefield" in literal sense, feared by enemy. And his character of high sense of justice makes him a good candidate for the role as a deity. And people who worship him although initially due to the fear of his wrath, but not to invoke him as a figure to carried on flags to battles (you want to avoid him, not close to him). Latter, he becomes more down to earth with civilians as a guardian deity, cause bad guys as soldiers of the enemy afraid of him, so he will prevent you from harm. (Probably actually work, if enough soldiers believes him as well). And as you can see, a deity although started as a fearful figures, and in polytheism religion framework, his role shifted toward peaceful purposes.
However Guan Yu is not the only god of war. There are protectors in Buddhism like the police who guard the innocent and enforce the laws, although the judge is the force of nature as karma itself. Buddhism doesn't work the way as in monotheism religion. Then you might asked what the functional role for the real war god, who told you which enemy's head to chop off, and judge you after death. In monotheism a god must be judge and jury at the same time, it's not true in polytheism view. The roles are divided and specialized like in real world social structure. Hence a fearful god of war (戰神) do needed, and not to be liked but hated, as reflection of the soldiers who are just following orders from superiors. There is one in Taoism as Chi-You (蚩尤) as an evil god, or opposing god, who wage wars against all living thing. And he too comes from a possible historical figures or leaders, or perhaps pure fictional. However due to his heavy roles in the origin of Chinese civilization (a lot like creation myth but only created nations). Sadly he got to play the part of the opposite side. And for every winner, there is a oser, so he too being worshiped by the people who lost the prehistorical battles for dominating China, and now become minorities. So in folk religions the god of war Chi-You, plays the part that people should hated as what he stands for, and gather around to fight someone who worship him. Like making a fake enemy, so people can gather around to the leader, and over look the financial or internal conflict issue domestically. You can find records basically saying Chi-Yu is coming back from the stars(heaven, spiritual world) to the world and mess around, so we have wars now. Be strong! and gather around! Sound familiar? Religion deities have always making huge roles in human societies and conflicts. Hence if you want to know if there is god(s) who promote hatred? Yes, and No. His duty may be to provoke the sense of hatred toward something, but only as functional as its used to facilitated the purposes of the human ruling parties.