Question Text: Why did God plant death upon the human race and why wouldn’t he grant life for those worthy?
Answer Text: The Bible is very clear that death was NOT a part of God’s original creation. We read about creation of man in Gen.1:26-31. V.31 ends with the comment. “very good’. If death and decay was a part of the creation, such a comment would be out of place.
But in the second chapter God tells man that if he ate from the tree of knowledge of good and evil, he would die (Gen.2:15-17). And from the third chapter of Genesis we know that man disobeyed God and thus man brought death into the world.
Please read what St. Paul says about the coming of death in to the world from Rom 5:12. “Sin came into the world through one man, and his sin brought death with it. As a result, death has spread to the whole human race because everyone has sinned”. So it is very clear that death is the result of sin and if there was no sin, there would not be death in the world.
Now, the second part of your question is self explanatory. Surely God would grant life to any one who is worthy! In the Old Testament we know that Enoch did not die (Gen.5:24). So is the case with Elijah (2 Kings 2:11). The Bible clearly says that God has no partiality (Rom.2:11). If some one today were to live like Enoch or Elijah, surely they would not need to face death. Have you found any one with out envy, jealousy, malice, pride, anger, selfishness etc. which are sins which separate us from God?
In fact, death means separation. But God in grace offers free salvation through Christ our Lord by His death on the cross (Rom.3:23-26). And to a believer in Christ physical death is just a sleep as Jesus promised that those who believe in Him shall never die (John 11:26 cf. 1Thes.4:15)! Praise be to His Holy Name. Amen.