To answer your question, Master Venerable Chin Kung once said
that the objective of building Buddha statue is to remind us of his
teachings and to be good. Statue in general, does not posses any
power or so. Building and constructing Buddha statue can influence
people in thinking that the Buddha is great. When we look upon the
Buddha, most people would not dare to commit crimes, being afraid
of punishments. You can see how a statue can influence people into
doing good, hence reaping positive karam to the person who has
constructed or build it. The Buddha statue is also a kind of symbol
of Buddhism. Why are there so many people claiming that there are
ultimate powers in the statue or amulet? It's very simple. Human
are consistently manupulate many different ideologies for business
aims. They claim that by letting their master or what-so-ever bless
the statue, it will be filled with auspicious power. Let me ask you
a very logical question, if the person claim that it can be blessed
by himself/herself, aren't they claiming that they are stronger and
more auspicious than the statue? However, for the amulet issue, it
depends on what kind of amulet. There are thousands of amulets
claimed by different people who said it possess different
protection. I have not research on that yet but, there is an amulet
which will never be a fraud one, that is, The Surangama Mantra.