Dear Bro. Samuel,
Parts of your questions were not very clear to me. But I am trying to answer to the best way I understood the questions. Please rephrase the questions if I messed up the intended meaning.
"Is there any remedy for this sins?"
....There is deliverence for believers, to some extend here on earth, but permanently once glorified.
"A normally born human bieng in this world is a born sinner, his soul is bieng redeemed by the precious blood of our christ, As per your saying and quoted, do this above said terrible things, they have internal sin, which is seen by God , and the external sin which is seen physically."
....Physical illness is not necessarily the result of personal sin. It can happen as a judgment from God to His children. But that is more of an exception than normal.
"A leper who is not healed physically accepts Lord as the personal savior, is he not redeemed from his eternal sin.Is he not a member of the body of the Christ ?"
..... Most certainly! He may still die as a leper, but will be resurrected and become perfect.
"Suppose it happens to any of our children or close kith or kin, we are reddemed from the sin and as you said the children are innocent, how can we get redeemed from it."
(I am not sure if I understood this q. correctly.)
Even when we are saved, as long as we live on this earth that is CURSED BY GOD to produce thistles and thornes, we have only a limited escape until we are glorified. We live on an earth CURSED BY GOD.. CURSED BY ITS CREATOR!
But our blessed God made everything possible to redeem it. Until that happends the earth is under GOD'S CURSE.. But believers have much to rejoice, because the presence of the Holy Spirit within them makes them stronger than the one outside (Satan).
This gives us much needed protection, yet we live on this corrupt, cursed earth.