Stavros, firstly I never said that the Buddha's image is that of a demon. I think it is more or less the image of Siddhartha, who was not a demon. Secondly, I do not think other religions have sacred objects. Thirdly, I am not suggesting that you go out and burn down synagogues, take a sledge hammer to Mosques, or put a stake through the Qur'an. I am suggesting that you not support religious devotion to an idol. Would you donate money to mosques or synagogues, or a Buddhist temple? Would you offer to pay for a new building for them (assuming you had the money lying around)? That is, essentially, what you are doing by donating the items to a Buddhist temple.
Again, I do not see how it is disrespectful to, in the privacy of your own home, dispose of your own property. I am not saying you go up to a Buddhist man and say "Watch this!" as you smash the Buddha statutes. I am saying you should dispose of idols. As well, why would it matter if we lived in Greece or Russia? Would living in an Orthodox society make it ok to destroy idols, while living in a multicultural society makes it wrong? Is right and wrong determined by where you are? If so, it isn't really right and wrong, but merely what society expects of you - and since when did the Church care about societal expectations? Certainly the pagans of Russia didn't expect St. Vladimir to order the destruction of their idols, yet he did so nonetheless. I do not see why it is disrespectful to dispose of idols if you aren't doing so with the goal of upsetting Buddhists.