It should be understood that basic purpose of worship is meditation and contemplation; and name and form are essential for meditation. Everywhere people coordinate feelings and symbols in order to refine their sentiments. Every nation has its own national flag. Its citizens pay reverence to the national flag and get infuriated  when it is insulted.

Even communists, who consider themselves atheists offer salutation to the red flag and when they go to Russia they pay a visit to Leningrad to have a glimpse of the place where Lenin’s embalmed body has been kept.

Muslims who do not believe in idol worship offer their prayers  facing Kaba. They kiss the symbolic stone ‘Sang Asavad’ of Syah Moosa in Mecca. 

The obvious reason is that it is convenient to concentrate the mind with the help of symbols. The work of teaching the alphabet to children becomes easy when it is done through pictorial symbols as Ka- Kabutar, Kha-Khargosh, Ga- Gamla, Gha- Ghadi, and so on in Hindi. The same principle applies to installation of idols of gods and goddesses.