Idol Worship – Form of God Needed to Steady the Mind. Muslims & Christians Too Use Forms
Swami Sivananda: Generally, people say Hindus are idolaters. But a Muslim too has the symbol of Kaaba to remind him of Allah. Similarly, the Christian has got the Cross. The truth is that an anchor is needed in the beginning in order to steady the mind. So forms are necessary.
Only a microscopic minority are capable of taking up Nirguna Upasana (worship without name and form). 99% percent of devotees need a name and a form to fix their mind on God.