What I find peculiar is that those who appear to be the most adamantly against Catholicism are those who believe in Eternal Security and that the gifts of the spirit are no longer relevant for today. If you study your church history you will learn that both teachings clearly originated in the Catholic church, centuries after the early church fathers had died and supposedly, by the own admission, "new revelation" had ceased.
Those that teach you are not secure in Christ ALONE for salvation(ie: requiring works in addition to faith or lose salvation), as clearly evidenced in the Word of God are not teaching sound doctrine. Because those that came to Christ under condemnation of the law do not even THINK they have a license to sin! They recognize the INFINITE love of Christ and what He done...
"Beloved, when I gave all diligence to write unto you of the common salvation, it was needful for me to write unto you, and exhort you that ye should earnestly contend for the faith which was once delivered unto the saints. For there are certain men crept in unawares, who were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness, and denying the only Lord God, and our Lord Jesus Christ." Jude 1:3-4
Ungodly men are those that never came to Christ through the law for the forgiveness of sins. Notice that "ungodly men" are not referring to Christians, but to those that crept in thinking they have salvation because they were led in the WRONG idea out Christ....Because where is boasting in Christ Jesus? To say that we did ANYTHING(good works) to get salvation???
"For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast." Ephesians 2:8-9
To claim that those that teach eternal security are promoting sin depends on WHO the person is that is teaching it! A wolf in sheep's clothing can preach it too!.....But a Christian, who understands grace, does not even think for a second that they have a license to sin! See Romans 3.....Particularly Romans 3:8
"And not rather, (as we be slanderously reported, and as some affirm that we say,) Let us do evil, that good may come? whose ****ation is just."
These are the wicked who pervert the gospel, who say that sinning promotes more goodness(that grace may abound)....So, I dont go by church history more than relying on the Word of God.