On the church burnings. How can you get caught burning down a church ?. Getting away with murder is slim with technological advancements. A church arson on the other hand.....
It would be pretty hard to narrow it down even if they had a hair sample. Unless you've been seen there before,someone saw you,you know someone at the church, you would probably not get caught. Unless a town,city wants to match DNA,prints up with everyone in the area if any are left. You know how much prints,DNA is probably at a church anyways.
Put on a mask,hat covering your hair,wear gloves,long sleeves,etc...
Retrack your foot prints destroying each step around the area of the church,make sure it's not in the day.
Actually take your shoes off a good distance from the church so your foot prints would not lead exactly to the church so forensics could not match prints. Double up on socks,etc...
It can't be that hard.
Not that I want to go try it or anything.