How do we obtain that free gift of salvation? We have to receive it by faith! That's it! We are saved by grace through faith.
For thus says the LORD: "You have sold yourselves for nothing, And you shall be redeemed without money."
For you were bought at a price; therefore glorify God in your body and in your spirit, which are God's.
•~I Corinthians 6:20
In Him we have redemption through His blood, the forgiveness of sins, according to the riches of His grace
For by grace you have been saved through faith, and that not of yourselves; it is the gift of God,
not of works, lest anyone should boast.
"He who believes in the Son has everlasting life; and he who does not believe the Son shall not see life, but the wrath of God abides on him."