Psalm 3:8 Salvation belongeth unto the Lord: thy blessing is upon thy people. Selah.
There is and always has been the insistence that man can save himself. People consider themselves spiritual and in an effort to save themselves tell themselves and anyone who will listen that all you have to do is grow spiritually. Sounds good on the outside, but what is the standard? How do you measure spiritual growth? How do you grow spiritually?
Advancing the human condition without goals or standards is nothing more than self-worship. They will not admit that but being better for the sake of being better is to glorify self. Every self-help idea is based around effort produces results. Works save you is the bottom line.
Ephesians 2:8-9 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.
Boasting is the glorification of self. The last thing these people want is for the glory to go to anyone else but themselves. Christianity is the only religion that says you cannot save yourself. That is why it is rejected by these spiritualists. There claims against Jesus Christ are not based on investigation of truth but rather pride of life.
1 John 2:16 For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world.