I know the feeling. When I was young I would practice daily, and my coven would meet often. Then we graduated and life caught up with us, we saw less and less of each other and my schedule cut down on my ritual/meditation time. There came my lowest point a year or two ago when I questioned things. I began to read more, I went back to the basics, and tried to set time aside to connect with the world around me.
Meditation is a good option. Every day, set time aside to meditate, or reflect. If you don't think you can, look at your life, make a list of everything you do in a day and how long it takes. Maybe you could cut down on internet time, or incorporate your faith while walking to work/school. I walk everywhere, on my walks I observe the world around me, I become aware of things, and I make a list of things I'm grateful and say a quick prayer, something like 'thankyou for this rainny day [I love those] I hope the flowers bloom in the garden as a result.' Little things can become big things as you move on.
There's also something [almost certain Scott Cunningham came up with it] called the 13 Goals of a Witch. It can be edited at the persons views, but Cunningham discovered that every witch could live by these 13 things. I'm currently working on it and its helping me. They're things like 'know yourself', 'know your craft', 'meditate' and so on. Basically things to live by. Even if you aren't a witch its worth a look.
http://www.thewiccanway.org/13goals.html [list of the goals]
I would look inward, and try to do daily meditation, a monthly circle, any try daily prayer. I currently say one in the morning and one at night, but I know people who also say a prayer before each meal [including snacks] its up to the individual, but you should look inside. Don't make a logical answer, listen to your heart. No one can say for certain if a deity does or does not exist, you must discover for yourself.