"Obesity is a disease" sounds like; "Hey I am fat, but it is not my fault." The same goes with laziness; the last person to blame is always oneself.
Laziness was mentioned in the Bible numerous times, there is no doubt that it is a sin. Despite of our sinful nature, God still love us and He is willingly to take us as His bride. We are all destine to die and the only way for salvation is through Jesus.
So stop pointing fingers and repent.