Worship of Ganesha and then Muruga will lead to Siva

Devotees begin with worshipping Ganesha, then are lead to Lord Muruga, who takes them to Lord Siva

Image of Satguru Sivaya Subramuniyaswami
All Hindus have guardian devas who live on the astral plane and guide, guard and protect their lives. The great Mahadevas in the temple that the devotees frequent send their deva ambassadors into the homes to live with the devotees.
—Gurudeva