Would I have to give that up?
You don't have to give ANYTHING up. Remember the "1/3 your own conscience and beliefs" part. Episcopalians make NO effort to control you, what you believe, what you do, your behavior, nothing. You can join even if you don't agree with all the church's doctrines. You can attend all you want without joining. There are no spies: "OMG we saw her doing Mary stuff! Tell the Vicar!!" Of course, you'll get some glares if you fart loudly or your cell phone goes off during the sermon, but that's about it. {big grin... my icons don't work}
Oh and yes, it's open communion. It's printed in my program "all baptized Christians are welcome to partake..." but nobody's gonna body block you at the altar rail and demand to know if you're baptized or not.
Oh, and beware the coffee at the coffee hour. You're safer with the punch. {hee hee}. The homemade cookies are great however, and bring your wallet for the Great Sunday School Bake Sale. You'll not get better at any bakery.