First of all, is there any place where people tend to gather and meet in your area besides in a Christian context? A pub? Some kind of hobby group you would feel like being a part of? Our even a community group for your area, gathering to discuss what to do about that hole in the road to school and other things like that. Both you and your husband should make a point of joining these kind of groups, even if you will be stared at at first it will show a willingness to be part of the community and give other people a chance to actually get to know you. Usually, just such a thing as sharing a cup of coffee while you discuss the state of the biggest tree in the playground makes people more relaxed towards you and is the first step towards making their assumptions melt away and replacing them with a real image of you and your family.
So, even if it might be hard to find the time, make a point of being active in the community.
Also, such a thing as taking a walk around the area with your son when the weather is good is a good thing to do. Stopping when you see a cute, friendly dog and asking if you can say hello. Praise the dog. Ask the owner how old it is, what breed etc. if you don't already know. Then introduce yourself if it is a stranger as "x x living in house x". You will probably get the other person's name. Say it was nice meeting the person and the dog and be on your way. When you come home, write down the name of the person and the dog. Usually, these brief meetings with strangers are discussed by other people, who will ask: "oh, what did you make of her?" and hopefully the other person will answer "okay...nothing strange." Or something along those lines. It helps to break down the image the community might have of you as "Different/Other".
Thirdly, if there is any kind of problems with the playgroup because of your son's name or skin colour address the issues. Don't be afraid of conflicts when it truly matters. I don't think that it will really be that big problems with your son and the other kids at the tender age of two. Small children don't tend to connect a name or colour of skin with anything in particular. What problems there can be is other parents not wanting their children to have anything to do with yours, or even the preschool teachers discriminating your son by taking the sides of the other kids when there's a fight and other things like that. Keep an eye on it.
I very much wish there was a magic cure to all the problems you will face in the years your son is growing up, but the best you can do is try to make friends with people who are open to it and NEVER accept discrimination against your son. Be it a friend of his suddenly saying "I can't play with you because my dad says so" or a teacher repeatedly failing him in a certain class just because he can. It happened to my sister when we were growing up, just because the teacher didn't like her. And then, we were not battling racism back then (since we're of Swedish/Danish decent, blue eyed and blonde and fair skinned and all that). All we were battling was a teacher not liking her!