I feel for you. I also was raised Christian, but had to leave a long time ago.
Many many people are in your shoes. The idea of diety is so huge, really it can't be put into words, IMO. It is ineffable. When we try to describe it, we will always fall short of the mystery and greatness.
The childlike faith you miss, maybe it was inevitable to lose it, as you mature. I have heard faith compared to a vessel. When you are young, it is small, it takes less to fill it. As you grow, your vessel is larger, and it takes more ( information, experience, fellowship with others, reading, prayer, ritual, whatever) to fill it, for the same amt of faith to result.
Many people doubt the infallibilty and absloute truth of the Bible. It is a series of books and essays, written over a centuries long period of time. Did you know, the "Old Testament" is only a fraction of Jewish teachings? Xtians really sell them short with the books that are included in the OT. The entire Bible was written by men, without the benefit of modern science. It was imagined, just for ex: there was a firmament in the sky, a dome, which held back the rain. Above this dome was heaven (or 7 heavens), where god and the angels (powers, authorities) lived and sang and and sat on thrones. I take it as legend or symbolism or psychology. I find it hard to take it literally, in this day and age. JMO. You can do this with every biblical story. Take it as fact, as a child would do, or look deeper for meaning encoded within.
Did you know, as well, there are dozens of other Xtian writings that early church fathers voted out of the "official" Bible? If you like history, and digging into things, you can get a great picture of the history of Christianity by reading The Jesus Mysteries, by Freke and Gandy. Another great book, is the Other Bible, a compendium of all those "other writings," painfully unearthed over the last couple centuries, that were left of of the Xtian canon.
To find the similarities between Xtianity and paganism, see this site:POCM
You can also find books on similarities between Xtianity and Buddhism.
As far as UU, we have found one in the next town that is very spiritual, healing, beautiful and friendly. UU churches, like LLL mtgs, vary from one to another. Maybe you will find another one more suited to you? We are lucky to be in NE,with one in every town.
To sum up, I am not trying to disrespect anyone's ways of believing, Christian, Jew or otherwise. I am speaking to marcy, a seeker, a doubter, like myself. We are all different, and there are many "roads up the mountain." I find, marcy, that studying religion, and seeking god, can be quite uncomfortable and make me uneasy quite often. But here we are, in heavy bodies, spirits, more or less, trapped inside a "meat puppet." It isn't always a comfortable, warm and fuzzy place to be. I wish you (and everyone) good luck and lots of fun and adventure on your own personal journey!