I think you're being very smart about this. The roads here in Baton Rouge are also not bike friendly. I've been trying to think of places I could park and commute in (once the knees are fixed). The only problem is the ginormous trucks that pass on the road I would end up taking after dropping off my car. It sounds like you'll be able to avoid the rough spots by driving part of the way. I would pick the church and ask permission, too. If the road by your house is dangerous, all the confidence and speed in the world will not necessarily make it safer. Like Geonz said, there's no need to increase your chances of becoming one of the stats.
Good luck, be safe, and let us know how it turns out.
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Elizabee (age 5) at the doctor's office: "I can smell sickness in here...I smell the germs"