Is deity worshiping harmful to human society then simple worshiping to /Almighty?

Answer 1

Worshipping deities such as Shiva, Krishna, Saraswati and Rama is very good for you, it brings you into close(r) relationship with God. They are all aspects of God (Brahman, the Unmanifest) and they will help you. Choose the Form that most draws you.

But if you prefer to worship God as the Formless Light, that is OK too. God will come to you in that Light when you have refined your consciousness enough, just as readily as She will come to you as Kali if you focus on Kali.

Whichever path you take, first, God will come to you as hints or glimpses, to help you along the way.

Love, bhakti, and meditation go all the way Home.