Only Jehovah God determines who can be saved. True Christians can be in a saved condition in that they are in an approved position before God. But individually, they must meet God's requirements. The possibility remains that one can fail at any time: "If anyone does not remain in union with me, he is cast out as a branch and is dried up." -John 15:6.
In order to receive "everlasting life", Jesus said that we must take "in knowledge of you, the only true God, and of the one whom you sent forth, Jesus Christ." - John 17:3
Clearly, Jesus thought that it was important for us to know the true identity of God and His Son. (See WHO IS “the Only True God”?)
For more, see
What Must We Do to Be SAVED?
Search For Bible Truths - ARCHIVE
Search For Bible Truths - Search Guide