Many may think buddhists are idol worshippers, because as buddhists, we do place a lot of importance to statues.
But there are good and logical reasons for this :
1) Buddhists make prayer and offerings to statue on their altar, we are avtually making offerings and prayers to the qualities the buddha/diety represents so that one day we will be become the perfectionist of the one we make prayers to.
2) Buddhists like to make BIG statues, I have been asked many times, why do temples have such huge statues, are we promoting others to just pray to big statue? And it must be a waste of money also. Well, lets put it this way, size does matter and protray certain status or importance. Give you an example, the house of the prime minister is big, even his car is big, what does this simbolize? It means that the prime minister is seen as an important person and his status warrant such a house or a car.
So when we make big statue of a buddha/diety, it also draws the same reason in the eyes of the normal people, that this buddha/diety must be important and require such a magnitude to represent him.
However, the real meaning of making big statues to worship is actually for the collection of merits. The bigger the buddha statue/image we can make or afford to offer, the more the merits we collect.
3) There is also a common phenomena that non buddhists may mis-understand why we are prostrating to lamas or gurus. They think we are really idolizing these lamas. As a matter of fact, when we make prostration to lamas/gurus, we are not prostrating to them as a person, but to the dharma knowledge he has and is going to disseminate to us.
I hope I have clarified some common mis-conceptions of buddhists being idol worshippers here.