Refutation of the Common Protestant Eisegesis of Ephesians 1:13-14 and 2:8-9

And you also were included in Christ when you heard the message of truth, the gospel of your salvation. When you believed, you were marked in him with a seal, the promised Holy Spirit, who is a deposit guaranteeing our inheritance until the redemption of those who are God's possession--to the praise of his glory. (Eph 1:1314 NIV)

For it is by grace you have been saved, through faith--and this is not from yourselves, it is the gift of God--not by works, so that no one can boast. (Eph 2:8-9 NIV)

While one will disagree with them on a number of issues, the Dimond brothers (Sedevacantists) have posted a useful video refuting the common eisegesis many Protestants engage in with respect to Eph 1:13-14 and 2:8-9:

What Millions Of Fake Christians Get Wrong About Ephesians

There is a good discussion here of baptismal regeneration in Ephesians. For more, see, for e.g.:

Peter S. Williamson on Baptismal Regeneration in Ephesians

Stephen E. Fowl on baptism being salvific in Ephesians 5:26