Here's the reason why Calvinism is mentioned. Calvinists take what is taught in 1 Corinthians 2 and twist it so that they can claim that the unsaved natural men CANNOT comprehend the Gospel. Which robs the Gospel of its power under the power of the Holy Spirit.
And because of that they claim that unbelieving sinners receive the gift of the Holy Spirit in order to comprehend the Gospel and be saved. Which is absurd.
The Westminster Confession of Faith spells out Reformed Theology (Calvinism) in detail. Here is what they say about this matter, which practically states that the sinner is born again BEFORE he is born again:
"All those whom God hath predestinated unto life, and those only, He is pleased, in His appointed time, effectually to call, by His Word and Spirit, out of that state of sin and death, in which they are by nature to grace and salvation, by Jesus Christ; enlightening their minds spiritually and savingly to understand the things of God, taking away their heart of stone, and giving unto them an heart of flesh; renewing their wills, and, by His almighty power, determining them to that which is good, and effectually drawing them to Jesus Christ: yet so, as they come most freely, being made willing by His grace."
If it is disrespectful to call false teachings "absurd" then so be it. You should read the writings of the Early Church Fathers when dealing with heresies. What I said is extremely mild.