A cyberspace devotee, Devananda in Rosehill, in the beautiful country of Mauritius asks, “Hindus are supposed to identify one or another God to worship and choose their own Ishta Devata. How do they know which one to choose?”
Devananda, it works exactly the other way around. The God or Gods that you are to worship choose you, to communicate with you, through Their image within the temple.
You mentioned in your question that you are drawn to Lord Ganesha’s shrine within the temple. You are drawn to Lord Murugan’s shrine within the temple. This means that Lord Ganesha and Lord Muruga have messages for you, training
for you and They want to communicate with you. So even as you think of Them, it is like thinking of a friend or your mother or your father or your Guru. You are communicating psychically.
This is the great magic of the Sanatana Dharma and why it is on the earth today, through all the many ups and downs and attempts to destroy it. It is still here, a religion in renaissance, moving forward and spreading very rapidly into every corner of the world.