Hey Emma!
Wow...I'm not sure I have the perfect answer for this question, but I'll give it a shot.
**this is *my* beliefs...others may feel differently**
God absolutely is a real presence in my church...but not just in my church, He is a real presence in my life - in every aspect of it, whether at church, at work, at school, at sporting events, at whatever. God is a real presence because He lives within me...but I think you already knew that point...heehee
As for communion...the bread and *ahem* grape juice

D) are taken symbolically to represent the body and blood of Christ. We do not serve fermented wine...that would imply that Christ's blood was tainted, thus signifying He was a sinner, which is blasphemy. At my church, we also serve unleavened bread - which quite frankly, tastes like stale bread!
The bread and wine do not literally become the body and blood of Christ. That isn't necessary, nor do I believe it to be Biblical, personally. God is still a real presence - however, it's a spiritual presence, not a physical presence. The same presence that is in our church and lives. By placing the bread in our mouth, we are not remembering Christ by our mouth, but by our faith. The same goes with the wine/juice. Just like Baptism (water immersion), the Lord's Supper is symbolic. With baptism, it is symbolic of being "buried with Christ, and raised to walk in newness of life in Christ Jesus." (to quote my pastor

) The Lord's Supper is symbolic of His Death and is to be done until His Return. Christ has already died and rose again - the payment has already been made. The Lord's Supper is to *remember* that. "Do this in rememberence of me."
On a side note, many Baptist churches also have the Lord's Supper at night - because that was when it took place. Little bit of trivia.
