Primarily mans religion says that man must do something or he will be lost, that apart from him doing something, salvation isnt possible.
How about doing something that removes one from the "to be saved" list?
All man made religion is under the delusion that they are alive to God, not understanding that by nature we are dead to God.
That's not what Paul says...
I was alive once without the law, but when the commandment came, sin revived and I died.And the commandment, which was to bring life, I found to bring death.For sin, taking occasion by the commandment, deceived me, and by it killed me.Therefore the law is holy, and the commandment holy and just and good. - Romans 7:9-12
http://www.biblegateway.com/passage/?search=Romans7:9-12&version=NKJV
The law kills, but the spirit brings life.
Paul said "I was alive before the law came." He's referring to the period of time before one reaches the age of accountability (which is different for every person, and some people never reach that age), which is the age at which one is able to recognize what is right and wrong, and chooses, willingly, to do wrong. The LAW is the Knowledge of Good and Evil (where else have we seen that phrase before? Hint: Genesis)
When the law comes, when one reaches the age of accountability, they die, because sin revived...
Wait, revived? Yes, revived, because it was DEAD in them before they reached that age. When was sin made "dead"? When Christ went to the cross!
That means that, since Christ went to the Cross, every person born since that time has been, at first, DEAD
to sin, and ALIVE
to God, but when they reach the age of accountability, sin revives, and they die, separating them from God.
Man was murdered in the garden when he disobeyed God in Adam,
Adam is responsible for the Fall, but the sin of Adam has been wiped from the slate of every human being other than Adam. It is on the sin of every individual that one goes to Hell, and NOT of Adam's.
Punishing the children for the sins of the father is WICKED, and God Himself condemns it!
and so Jesus called him a murderer
No, Jesus called Satan a murderer.
Note the "your father
the devil," before the second "your father."
Jn 8:44
44 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
This is referring specifically to Satan, NOT Adam.
Man lost life with God, hes therefore dead to God!
Not according to Paul, as per above.