It's true. What they're defending is commonly referred to as, "Easy Believerism".
Believe, that's it. God won't call you to serve His kingdom on earth.
God won't ask you to represent His truth.
All you have to do to enjoy eternal life is, hold faith. That's it.
That's not it. That's not scripture. God predestined whom he would Save before the foundation of the world.
"And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified."
Romans 8:28
Colossians 1
And then he calls those whom He Saved to serve His will.
As we know in both Testaments.
Acts 13:2 While they were ministering to the Lord and fasting, the Holy Spirit said, “Set apart for Me Barnabas and Saul for the work to which I have called them.”
Jeremiah 1:5
“Before I formed you in the womb I knew you,
And before you were born I consecrated you;
I have appointed you a prophet to the nations.”
Genesis 12:1-3
Now the Lord said to Abram,
“Go forth from your country,
And from your relatives
And from your father’s house,
To the land which I will show you;
And I will make you a great nation,
And I will bless you,
And make your name great;
And so you shall be a blessing;
And I will bless those who bless you,
And the one who curses you I will curse.
And in you all the families of the earth will be blessed.”
Source:
https://bible.knowing-jesus.com/topics/Calling,-Of-Individuals