Here is what the Gospel says we must do in order to be granted eternal life

Lutero:

There is not a single word of the gospel in the Catholic doctrine.

Sure there was. But you don't really care for the Gospel. Here is what the Gospel says we must do in order to be granted eternal life:
Matthew 19:17

King James Version (KJV)
¹⁷ And he said unto him, Why callest thou me good? there is none good but one, that is, God: but if thou wilt enter into life, keep the commandments.

James 1:27

King James Version (KJV)
²⁷ Pure religion and undefiled before God and the Father is this, To visit the fatherless and widows in their affliction, and to keep himself unspotted from the world.

Matthew 25:31-46

King James Version (KJV)
³¹ When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory:
³² And before him shall be gathered all nations: and he shall separate them one from another, as a shepherd divideth his sheep from the goats:
³³ And he shall set the sheep on his right hand, but the goats on the left.
³⁴ Then shall the King say unto them on his right hand, Come, ye blessed of my Father, inherit the kingdom prepared for you from the foundation of the world:
³⁵ For I was an hungred, and ye gave me meat: I was thirsty, and ye gave me drink: I was a stranger, and ye took me in:
³⁶ Naked, and ye clothed me: I was sick, and ye visited me: I was in prison, and ye came unto me.
³⁷ Then shall the righteous answer him, saying, Lord, when saw we thee an hungred, and fed thee? or thirsty, and gave thee drink?
³⁸ When saw we thee a stranger, and took thee in? or naked, and clothed thee?
³⁹ Or when saw we thee sick, or in prison, and came unto thee?
⁴⁰ And the King shall answer and say unto them, Verily I say unto you, Inasmuch as ye have done it unto one of the least of these my brethren, ye have done it unto me.
⁴¹ Then shall he say also unto them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:
⁴² For I was an hungred, and ye gave me no meat: I was thirsty, and ye gave me no drink:
⁴³ I was a stranger, and ye took me not in: naked, and ye clothed me not: sick, and in prison, and ye visited me not.
⁴⁴ Then shall they also answer him, saying, Lord, when saw we thee an hungred, or athirst, or a stranger, or naked, or sick, or in prison, and did not minister unto thee?
⁴⁵ Then shall he answer them, saying, Verily I say unto you, Inasmuch as ye did it not to one of the least of these, ye did it not to me.
⁴⁶ And these shall go away into everlasting punishment: but the righteous into life eternal.

Do you believe in clothing the naked? feeding the hungry? visiting those in prison?

Yeah, I know. You save yourself by your faith alone. No need to obey God. So you think.

Hebrews 5:9

King James Version (KJV)
⁹ And being made perfect, he became the author of eternal salvation unto all them that obey him;

Nothing but a shameless boasting of self.

If you mean boasting about the Church which Christ built. Yes, that is true. Scripture does so also:
1 Timothy 3:15

King James Version (KJV)
¹⁵ But if I tarry long, that thou mayest know how thou oughtest to behave thyself in the house of God, which is the church of the living God, the pillar and ground of the truth.

Sincerely,

De Maria