The bottom line is not who was deceived and who was not, but rather, who had responsibility and who failed. Adam and Eve were given the responsibility to obey God's commandment not to eat the fruit and they failed. Has Adam and Eve joined together under the perfection of God's love, then their sexual experience would not have produced shame. They were good, innocent and flawless. They were not yet mature, however.
Maturity is their completion and perfection.
They would have to grow that ideal. The Tree of Life is a symbol of perfection, a symbol of the unchanging relationship with God that is impervious to temptation and sin. Christ returns in His second coming to give us the right to eat from the Tree of Life, which means to restore the original conditions of the Garden of Eden, which is the Kingdom of Heaven on Earth and in the Spirit World. The Tree of Knowledge of Good and Evil is mentioned only in Genesis and is a bit more difficult to understand. Basically, it represents the period of growth and responsibility that Adam and Eve had to fulfill within a certain time frame.