Satan deceives through religion. If it is your desire to be like God or to know as much as God, you are a candidate to be deceived.
Adam and Eve bought the devils lie that if they ate of the tree in the midst of the garden they would be as God's knowing good from evil. Of course it was lie and caused them to lose their relationship with God and their home in the garden, Genesis 3:4-6.
It appears that Adam and Eve wanted to be like God and know as much as God. It is Satan's purpose to lead one into religion. To lead one into religion is to lead one into themselves. Religion is man's preoccupation with his own spirituality. It is subjective. The Gospel is not subjective, it is objective (outside of us).
The whole purpose of religion is to cause one to lose faith in God and his Son Jesus Christ and to make the Gospel of no effect. In the doctrine of Calvinism it is taught that Jesus is not the savior of the whole world. So, we must conclude that God and Jesus made a deal with the devil wherein Jesus would only atone for the sins of some, but not all. That is not the worst. The worst is predestination. God chooses some to salvation and condemns the rest to hell. That is a real faith killer. How can anyone have faith in a God such as this?
In the Catholic religion, which is highly subjective and is works based, there are a multitude of things that you must do to be saved. Catholics are busy, busy, doing their religion. Catholics are basically doing in their flesh what God has already done in Jesus Christ. They are trying to reconcile themselves to God by their works. The Eucharist is nothing more than an attempt to be like Christ. Instead of trusting in Christ they are trying to be like Christ.
The Gospel is a really, really simple message. It is so simple that many are offended by it.
All that Jesus Christ is and all that Jesus Christ has done, or will do, is ours by faith alone. That's it! Do you believe it? Not many do, they want to add something to it. In Jesus Christ we have been, sanctified, justified and redeemed, That's it! When God accepted Jesus into heaven, we were accepted in him, That's it! God now sees us as perfect and complete "In Christ", That's it! All that God requires of you is that you believe in his Son Jesus Christ, plus nothing.
Paul said to the Corinthians, "But I fear, lest by any means, as the serpent beguiled Eve through his subtility, so you minds should be corrupted through the simplicity that is in Christ" 2 Corinthians 11:3.