Some things I have enjoyed over the years....
If you're up for such a thing, Huston Smith is a very well-respected author and professor. Because his family travelled a lot, he was raised as a Christian in a Chinese environment.
His early exposure led to his becoming quite an expert, teacher and author on world religions.
His books are wonderful. Particularly, 'Religions of the World'. He even did a multi-segment series with Bill Moyers for PBS. (You can find a whole lot on Amazon).
Of course, these things will give you an essence of world religions including, but also beyond Christianity and Judism (like Hinduism and Buddhism). But it is a fascinating and respectful look. (Particularly at Islam, right now, but that's another story).
Currently, I'm really enjoying 'The Complete Idiot's Guide to Understanding Catholicism'.
Rodney Stark, who I am currently very angry with (as he is featured for some reason - God only knows what - on a JW press video), wrote many books, two of which I can recommend highly.
'The Rise of Christianity' is the history of the early church and some thoughts on why it grew so rapidly after Christ's death. It gives a very palpable sense of what it was like to live in Rome at the time of Christ and immediately after. (An early chapter on the diaspora was very hard to grasp - for me - but can easily be overlooked with no loss to the main story).
Another is, 'The History of Religion in America' (Rodney Stark again), which looks at many denominations and how they got started in America and what kinds of circumstances helped them flourish. It will give you a really good 'sense' of various religions.
Tho, Mr. Stark's current position with the WTS has hurt his credibility somewhat in my eyes.
Last I heard, he was an agnostic, wishing he could find faith.
I wish he could find faith, too.
For a wonderful faith experience, I highly recommend 'Closer to the Light' by Dr. Melvin Morse. He's a pediatrician who had a profound experience with a very young patient who was recovering from a near-drowning/near death experience. Dr. Morse was so moved by that event, he decided he wanted to talk more to lots of kids who had near death experiences and that is his book. It's fantastic.
And very beautiful.
I wish you luck and hope and faith in your search. Don't push your kids one way or another but acknowledge their faith experiences - and your own, too. You're the grown-up. And you don't have to have all the answers. Just be honest.
It sounds like you're doing a good job of that already. Every religion is about seeking God and communing with God.
As the first chapter of the Catholic Catechism states, 'man is a religious being'. And throughout all of history, man has nurtured a communal relationship with God.
I am very moved by the fact that Mohammed, in trying to bring the concept of 'one God' to a desert people who had no access to art or music or other religious 'things', looked to the sky for evidence of God's handiwork. (It's always there!)
In the midst of your faith journey, which can become noisy and cluttered sometimes, I hope you will also find a guiding evidence of God in nature.
Don't forget that you're the parent and don't burden your kids unnecessarily with concepts that are beyond their grasp.
It sounds like you're off to a wonderful start.
My best to you all.