Then Why is God kept in the form of stone in temples?

As many of us lack the inner vision..or havent tried it.. or experienced it to the level that is possible..our ancestors have created idols to atleast know that there is god.. but they have unknowingly concealed the fact that God is inside us..in a way..when they have taught us how to recite slokas..(sanskrit /tamil language conversations that some people in old age had with God)..they have indirectly learnt us to talk to God..But in my view..language or the way of poetry does not matter when u talk to God..He understands everything we understand...

Is God existing?

Are we existing??? If Yes.. then Yes.. God is existing inside us...Our intellect + heart , is God.. Our manasaaatchi is God... When we try to do something (good or bad).. we pretty much know wht we r doing is good or bad..if we have clarity in thoughts and peace in heart..this idealization or the factual realization is God... Staying integral with truth, inner self is ideal.. By looking or concentrating into inner life..(real thought processes).. we have chat with God and have meaningful conversations and lead a happy life..