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http://www.episcopalchurch.org/. There is excellent background material on Christianity in general and the Episcopal Church in particular there.
You can locate a parish (church) in your area through that website. You can also find the diocesan (district) office through that site. Call and ask them where the liberal (or family-oriented or large or ...) churches are in your area. They'll know! If a gay-affirming church is of particular interest to you, see www.integrityusa.org for background and contact the chapter in your district for assistance.
One bit of advice -- if you're not used to liturgical worship, it may seem confusing at first. Please just relax -- you're not going to make some offensive mistake. After just a few services, it gets easy to follow along. In the meantime, just ask your neighbor in the pew to help you. Most Episcopalians love their liturgy and are happy to guide you through it. It is a treasure we wish to share.
If you want to familiarize yourself with the Eucharist service, an on-line copy with annotations that explain what is going on can be found at
http://www.kingofpeace.org/resources/.Important note: You are welcome at the Communion rail. Some churches follow the canon (rule) that only baptized Christians may partake; many churches -- especially the liberal ones -- welcome you wherever you are on your spiritual journey. In either case, no one is ever turned away, so please follow where the Spirit leads you. In general, nobody in an Episcopal church will embarrass or single you out in any uncomfortable way. We're polite to a fault. More on that later.
Some practical details -- you can take Communion in a number of ways. While kneeling at the rail -- the ushers will guide the congregation up, pew-by-pew -- place right hand over the left with palms open. The minister will come and place a wafer in your open palm saying something like, "The Body of Christ, the bread of heaven". You respond "Amen". You can then raise your palms to your mouth and eat the wafer. (Picking it up with your fingers is considered bad form, but, again, no one will scold you for it or, frankly, even care, since they're wrapped up in their own devotions.)
Then another minister comes along with a chalice of wine mixed with water and offers it to you, saying something like, "The Blood of Christ, the cup of salvation." Guide it to your lips by holding the base with your thumb and forefinger(s) and take a sip. This is the most common form of reception.
If you prefer not to sip from the common cup, leave the wafer in your hand after it is distributed. When the minister comes with the chalice s/he will take the wafer from your hand, dip it in the wine, and place it in your open mouth. Stick your tongue out a bit to assist. This method is called _intinction_. It is commonly used by children and many adults, especially those who gravitate toward the "Catholic" part of the Anglican heritage.
If you don't want either the wafer or the wine, say, because you're gluten intolerant or a recovering alcoholic who doesn't even want a small taste of wine, simply smile and whisper, "I receive only the wafer" or "the wine" and take one or the other. Rest assured you have received the full communion and the benefits it confers. I'll not go into that in detail, but you may be surprised at how deep a spiritual experience you can have on your knees at the Eucharistic Table. Be open and ready.
Finally, if, for whatever reason, you don't want to receive the elements (the wine and bread), please go to the altar rail, kneel, and cross your hands across your chest. The minister will bless you as s/he passes.
Phew! That was a lot of words to describe something very simple. Always remember, you can't make a mistake. If you come with sincere intentions, you can do no wrong. Everyone around you is glad you're there to share this heavenly feast!
The service ends pretty quickly after Communion, although you may have to sit through some announcements in some churches. Basically, though, you say a prayer of thanksgiving, get blessed by the priest, and are dismissed with a hearty benediction such as "Let us go forth into the world, rejoicing in the power of the Spirit!" to which you reply, "Thanks be to God!".
You'll generally have a chance to file out through the main door and introduce yourself to the minister. S/he will undoubtedly invite you to come back anytime and ask you to go down to the parish hall for coffee and a little nosh.
Here's where understanding a bit about Episcopalian manners helps. There are many members of any Episcopal congregation who are a bit lax when it comes to actually attending church. That strange man you've never seen in three years of attendance may actually be a long-time member who would be affronted to be greeted as a visitor. To be frank, at Christmas and Easter, I don't know who the hell 80% of the people in the church I attend weekly are.
So, if it seems people are shy to greet you, don't be offended. Identify yourself as a visitor to someone and 9 times out of 10, they will take you by the arm and introduce you to more people you can possibly remember.
Another note: Episcopalians are not particularly interested in what you believe. In fact, the great strength of our Church -- although its detractors call it a weakness -- is that all points of view are welcome. There are at least three or four skeptics or agnostics I know of in my parish who co-exist peacefully with as many evangelical Bible thumpers. Most people fall somewhere in between. Episcopalians in general tend to be much better educated than the average church-goer and ordained ministers are required to have not only a college degree, but three rigorous years of seminary training. It's said that there is no belief held by an Episcopalian that is not held somewhere by another faithful Episcopalian. Questions and doubts are welcome!
This post has gone on too long. But as a grateful member of the Episcopal Church, I'm excited to see you investigate the Anglican way of spirituality. Please let us know how it went!