Never pay down a deposit in a bank account until you have met the seller, seen signed a purchase agreement.
No serious private advertisers ask for a down payment before you meet.
Receiving an email with an in-scanned ID does not mean that you have identified the sender. You do this on the spot, when you sign a purchase agreement.
If you cannot pass a home check, please do not apply. Please fill out an adoption application here: https://rescueaware.com/application.asp?c=12001 (Sending...