Yes and the cornerstone, the one you call gnostic, the one Jesus builds is rejected because he is accused of gnosticism for being that corner stone.
Yes and you will go to the graven never knowing that what Jesus know in the Father yourself. You slowly perish in sin.
Your cornerstone is Paul not Jesus. You never repeat what Jesus said you should be and would be if you received from his Father that what he received from Him.
Beliefs are not real, Jim Jones and David Koresh had a belief in Christ and taught their beliefs in their temples as well as all these denominations do just as you do, presenting your own beliefs for your gods, all three of them.
The only thing at comes really by God is Him manifesting Himself in you, until then all you have is a belief about Him. Common among our churches.