Do Buddhists believe Buddha to be God? Do Buddhists practice idolatry?

I have seen Buddhists worship Gautam Buddha, a great personality, a great philosopher, a great social reformer and spiritual master, with incense and candles. They would offer flower to his idol made of up of rock, marble, metal, wood, etc and also offer bowls of water and eatables in front of him, like the Hindus.