No, there is no relationship between them. Sin is simply a name for any action you take that would be considered evil or immoral or against the god of a certain religion. Diseases on the other hand are the cause of bacteria, which are living organisms. In fact, because diseases are simply organisms reproducing and trying to survive by infecting a host and using it, diseases are one of the most natural things in the world.
Isaiah 33:24 says: “And no resident will say: “I am sick.” The people dwelling in the land will be pardoned for their error.” The Byington translation reads: “…the people that lives in it has its guilt pardoned.” King James: “…the people that dwell therein shall be forgiven their iniquity”. This verse harmonizes with the Genesis account which relates that the first human couple chose to ignore a divine command and thereby sinned. This course brought upon them and their descendants the condemnation of death (Romans 5:12). God purposed for humans to live forever free of disease (Genesis 1:26-28, 31). When God completed his creative works He declared the results “very good” (verse 31). It met His supreme standards of excellence. It was perfect. If Adam and Eve had been obedient they and all their descendants would have lived forever. Jesus also connects sin with sickness and that forgiveness of sins is related to the gaining of health (Mark 2:1-12). During Christs millenial reign, death will be eliminated (1 Corinthians 15:25,26) which will eliminate sickness and pain (Revelation 21:4). Please visit JW.ORG, under “About Us” for a brief heartwarming video “Why study the Bible?”
Yes. It is really pretty obvious. The Bible warns of it and reality proves it.
Just one example. The Bible says that pre-marital and extra-marital sex is sin.
Think of the STD propagated by ignoring that one piece of advice from the Designer of our bodies. Think of the pain that has occurred, even death, the ruined lives, the inability to bear children, the abortions, the relationships broken, not to mention the financial hardship and ruin; and the impact on the rest of the culture, the economy, etc.