I will say that perhaps one of my most powerful experiences with deity was when I visited an Evangelical Church a few years ago. I was definitely a practicing Pagan (in fact, I was there as part of a Pagan leadership program to experience other religions), and it was really fascinating how they really brought God into the room with them. I'm still not interested in Christianity, but I could sense his presence.
But what were they doing there to "draw down" God? They were doing consistent devotion -- invoking a sacred space, praising him, making offerings, etc. All things that are good core components of a pagan devotional practice. Of course his presence was so easily felt in a space where a whole community of people have been practicing consistently for decades. And of course, the Christian God is evangelizing -- he wants to be there for everyone.
It's harder for Pagans when we might be one of a small handful of people globally working with a deity, without the benefits of full religious organizations like a church that can afford to have dedicated buildings and full-time clergy. But it's not impossible.
I think that our Pagan gods are there, but they are often smaller in scope. The other thing is, our gods often have things to attend to. Not all of them exist to guide us, specifically -- a river god's first job is to attend to the river itself, not to call followers to them. (Some of them DO exist to guide us and protect us, though -- one of my primary deities is Guanyin, the Goddess of Compassion. Her primary area of interest is to help those who are suffering).
I find that sometimes the best way to engage with a god is to work with them -- not just in terms of doing devotion or making offerings, but to do their work with them. What do they want to do in the world? My profession is a social worker, so I often find myself praying to Guanyin. Want to get to know a river deity? Help clean the river -- that's your offering. In my opinion, that's way more effective at getting a deity's attention than occasionally putting out food or praying at an altar.
P.S. I always recommend John Beckett's work. He has a blog, Under the Ancient Oaks
, and a couple of books out that are great introductions to polytheistic practice.