We haven't heard about the religions that had nothing correct within themselves. Why not? Because they never got off the ground.
You claimed that atheism is a religion. Now you claim that every existing religion has something correct about it, so presumably this includes any "religion of nonreligion". You must therefore admit that atheism is correct in its sole claim of no god(s).
By the way, the thing that all religions have in common is called generally "the golden rule" and it is the same as Jesus's "New Commandment" which was the core teaching of Jesus. This teaching has nothing to do with death, sin, faith, grace, ancient writings, or "saviors"; it is all about the pure intention of the soul. Jesus also said that he brought nothing new.
But nobody except Jesus ever came back to tell us what really happens after death, if anything. Fear of the unknown.
You have no idea what really happened to Jesus because you have only read 4 out of the 28 written gospels.
Does it somehow pain you to find that the Beloved Master did not die and rot for three days? How is it that you seem all but forced to believe he could not have lived in human format following the crucifixion and went on to do his earthly work?
A misinformed person will think that Jesus is a savior, but he never once suggested that he was your "savior"; in fact, he said that the kingdom of God is not "here or there", i.e. in Jesus, but it is within
YOU. The churches have misinformed the people. There were over 28 full gospels written and known. A scholar from South Germany chose the four which were placed into your New Testament--need I say more? How can you continue to be so narrow?
The churches and church self-appointed priests keep the masses imprisoned. They do not dare even look upon other material than that which is sanctioned by the particular doctrine. Heaven might surely strike ones if they stumbled upon truth. These are the reasons that no Avatars begin or keep religious sects---they are only of God---sects are of man!
Jesus said: "That which is born of the flesh is flesh, and that which is born of the spirit is spirit." He had come for a specific reason and it was to experience as man and therefore, he lived as man. He appeared and disappeared at will, even before His crucifixion and Resurrection. As a matter of fact, His body was so finely attuned to the spirit, that it seemed to have no substance to it whatever at times. An account of this is found in one of the most famous Gnostic Gospels:
The Acts of John.
Jesus allowed His body to be crucified in an effort to again show you the body is so temporary that one should not become attached to it. Then he showed that he could utilize it or cast it aside; or appear as anything he chose. Men continually miss of the lesson's point. Ones must seek out and attach oneself to that which is permanent--the soul or spirit within. You must come to know that the aura or light that is seen around the physical body, even in Kirlian photography, is unaffected by physical pain or death and remains perfect even after the body is cut away or dropped. Note in the picturing of a leaf--cut a portion away and the energy light remains whole.
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