By "protest", do you mean picket? I don't think that would be such a hot idea for a couple of reasons.
The first is that that is essentially a political act and this is a spiritual issue, not a political one. It's a good way to tell people what you're against, but telling people what you're against doesn't do any good if they don't know what you're
for.
The second reason is that you may change someone's mind, but what you want to do is put them in a position for God to change their
heart and that isn't something you can do by chanting a slogan. You need to reach the individual.
When Paul went to Mars Hill, he didn't protest or picket. He didn't even try to dissuade them from their religion.
What did he say? He said (and this is pretty loosely paraphrased), "Hey, I see that you guys are into spiritual things. That's great. Let's talk about that." And he used their well meaning (albeit,
misguided) zeal for their religion as an opportunity to share the truth of Christ with them.
You have about one month to prepare. If it were me, the very first thing I would do is to pray about it. Pray that God will open your heart to what He wants you to do and that He would empower you with the Holy Spirit to speak clearly and boldly. Then, I would pray over the event and even go out to the park and pray over the park.
I would study up on pagan/wiccan/new age beliefs and what scripture says about them, so that you'll be able to answer objections, should they arise.
Of course, the best way to answer objections is to know the Bible.
Above all, remember that you're not going there to refute their religion, but to share Christ.
Sharing Christ is easy. All it is is presenting man's sinfulness, his need for a Savior, and finding that Savior in the person of Jesus Christ.
I've been a Christian now for about twenty years and I've shared the Gospel with people in every conceivable way. About a year ago, somebody turned me on to Ray Comfort and Way of the Master.
The way they teach you to share the Gospel is so easy, you'll say, "I can't believe I never thought of that". But the reason I like it is because it's straight to the point. It doesn't give them an opportunity to go down any rabbit trails or to derail the conversation.
It puts their sinfulness right on the table and makes them have to confront it and then gives you an opportunity to tell them about Jesus.
Here is an example I posted on another board ((and, yes, it really did happen this way)):
He was wearing a Beatles' t-shirt and so we started talking. I'll spare you the small talk and pick up where we started talking about the death of George Harrson (my answers in bold):
And it really is just that easy.
If you have a few minutes, take a look at these video clips. I really think they'll help you. "Seal Beach Kid" and the one with the punk girl are my two favorites.
You might also want to check out wayofthemasterradio.com and They go out on the street every day to share the Gospel and listening to them has been a big encouragement to me.
Also, go to
http://www.adventuresinchristianity.com/ It has audio of real life witnessing encounters that are just fantastic.
Above all, when witnessing, be sure to remember two things: (1) It isn't personal. Don't get upset or discouraged if they reject it. (2) Don't be discouraged if you don't see great results. Your job is not to save anybody. Your job is only to present man's sinfulness and need for a savior, and that savior in the person of Jesus Christ. Remember, even if it seems like you're not making any progress, you may be planting countless seeds for someone else to harvest.
http://www.wayofthemaster.com/watchwitnessing.shtml