This is kind of a touchy question, since people's feelings about religion can be so deep and personal. But it is an important one. I think you are right in feeling like there might be something missing that you could give to your kids. Religion, or the peace that comes with really deep faith in true principles, can give you and your children direction and purpose, and believe it or not, joy. Isn't that what we really all want?
I can only speak from my experience, but at the risk of making myself feel a little vulnerable, I will tell you that my faith in Christ and His gospel is the single greatest blessing my family has. It brings us together, and guides us, and brings comfort, and just too many good things to even write. Membership in a church provides so many resources for raising my family, and a strong support system, plus opportunities for positive friendships for my kids.
I belong to the Church of Jesus Christ of Latter-day Saints, which is often called the "Mormon" church. It is a very, very family oriented church, which I love. Sorry, I feel a little personal sharing this over the internet. It's a little embarrassing for me. But I felt the sincerity of your concern. Anyway, there is a website you can check out on your own without any obligation called www.mormon.org. It explains about basic beliefs and answers some of the big questions we all have about life, like ""Where did I come from?" "Does God have more for me?" "Did I live before birth?" and "Does God really know me?"
I know that getting your husband involved is a tricky situation. I think you have to carefully and prayerfully choose a path for yourself and take it one step at a time. If it is something that brings you greater peace and happiness, he may see that and a little at a time want to follow.
Anyway, I wish you luck and hope that you can find the kind of peace for your family that I know can come from this added dimension of life.