Your lender is letting you know that it understands you filed bk. It will gladly accept payments (hence the billing statement - some won't even send that) but it will not go after you if you do not. It's recourse is solely against the collateral if payments are not made.
As to reaffirming... There is absolutely no reason to sign a reaffirmation agreement for a debt that is secured by real property. Just continue to service the loan. Reaffirming means you are signing something that says "despite my bk, I will pay you. If I don't, not only can you take the collateral (which you have the right to do if I don't pay no matter what) but I am now giving you permission to sue the crap out of me as well".
Just make your payments and you will be fine.
As to your car, that is different. The bk law requires you to reaffirm a debt secured by personal property. Some lenders are sticklers (like Ford Motor Credit) while others are not. Your attorney should forward the documents to you once he/she gets them. In the mean time, continue to make the vehicle payments.