I am a Christian (Episcopal) mama working full time. Establishing religious practices WITH my child works a lot better for me than thinking of him as getting in the way of my spiritual time. Every day when we leave the house (I walk him to school, then take transit to work) we sing "This Is the Day that the Lord Has Made" and it helps me remember that every day, even if imperfect, is a gift from God with something to offer me. Every night after bedtime story, I read him Forward Day by Day and we might talk about it a little, and then we say a prayer together.
At times I've been very successful at reminding myself to pray by keeping my prayer beads in my coat pocket so that when I'm walking and put my hands in my pockets, I feel the beads and remember to use them! Even if I don't have time for the full cycle of prayers before I get where I'm going or need to talk with someone, it's better to do some prayers than none at all.
I keep a bit of Scripture in the corner of my bedroom mirror so that I see it when I'm fixing my hair in the morning, maybe reread it, at least think about it a little. Here are 7 examples.
I now have 2 Peter 3:8 taped up next to my weekly to-do list: "Do not let this one fact escape your notice, beloved, that with the Lord one day is like a thousand years, and a thousand years like one day." It helps me keep my perspective on time management and remembering to spend my days with the Lord so he can help me work everything out!
I sometimes read religious blogs and other inspiration during my lunch hour.
Our church isn't currently doing this, but for 4 years we had a brief service followed by potluck dinner on a weeknight twice a month. I made an effort to attend (with my family) as often as possible. It was less work to make a dish for the potluck than to make dinner, we got to eat a wider variety of food than we had made, we got a mid-week spiritual boost including Communion, and we got to spend some time with our church family--all in the time we would normally spend making and eating dinner, so it was efficient and fulfilling!
Compared to a secular working mama, I'm not sure I have any greater struggles...if anything, I wonder how they get through the days without having God to lean on!