That is not true. My bhakti is strong. I read many scriptures and do not distinguish between Vaishnav or Shaiva or Shakta. To me everything is part of Sanatan Dharma and it should all be respected as such. I pray to many deities/Devs because I know that thay are all forms of Bhagwan. I have strong firm beliefs and my Bhakti is stronger now than it has ever been in my life. Also who sets all these rules? Why is ekagratha a badly required neccesity for bhakti? I am living proof that you can pray to many forms of god and still have great devotion for bhagwan.
Jay Siya Ram, Jay Shree Krsna, On Namah Shivayam.