I am, but I can't escape the logic of focusing on the Supreme God exclusively who is always accessible since he is everywhere....
There is only one God and there is nothing beyond Him. But the reality of that one God is a mystery for us since He (as Brahman) is too large for our very limited minds to comprehend since our minds are always limited by time, space and person.
In the relatively very short history of humanity there have been several great teachers, masters or gurus who have taught people how to attain God. These great teachers have often been seen as special mysterious expressions of God Himself. Since many of such teachings involve some type of bhakti or love for the Supreme God, it is encouraged to use the personality of such Masters as vehicles for that bhakti. Even christians do this with their Jesus. Hindus call such devine masters Ista Deva's. You cannot feel bhakti for a God who has no form because of the limitations of the human mind.
As there have been more of such masters it is tempting to think of this as polytheism, but that is not the case. God can take many forms to instruct humanity according to space and time but He still remains the same One who cannot be known by the human mind. He expressed Himself in the form of Shiva, Krishna and perhaps in many other forms on this planet and on other planets but that takes nothing away from his Oneness.
As your bhakti, your love for the Supreme increases you slowly start to realise how He is everywhere and eventually you will realise His limitlessness. But in the meantime you can use the Ista Deva as your point of focuss, since the Ista Deva is already (mysteriously) merged with the Supreme.