I was wondering the same thing that was just asked..is she against it or just doesn't want to do it? Is there another time during the day before you go to work that you could do it with your children? Doesn't necessarily have to be at dinner. You could gather them all together and just say a prayer for the day, or at the end of the day, whenever you have a chance. I think it's great that you want to do that. The father is not only the "head", but he's the spiritual leader, as well. Kudos to you for wanting to instill that in your children.
I have a totally different view on religion. Most people consider "religion" to be going to St John's Baptist Charismatic Pentecostal Church of Latter Day Saints and Jehovah's Witness down the street. Not true at all. I claim to be religious, not because I go to church or because I condemn any other religion. I claim it because I am a christian, I worship God, and raise my family to. I go to church because "forsake not the assemblying yourself", plus we're blessed to have found a church full of true, Bible believing, LOVING people.