I suggest asking yourself:
Why would life necessarily have no purpose without god ? (Not quite sure what is meant by "without god.")
Why would life necessarily have no meaning if it has no purpose?
Why would would life necessarily lack significance or hope if it had no meaning?
I would think that “without god” means if god does not exist.
If God does not exist, then life has purpose without God. Humans can then define their own purpose, if they want to. Even if they do not “assign” a purpose, they still have a purpose. Nothing can exist without a purpose for it to exist.
If God exists, then God determines what our purpose is since God created us.
According to my religion we were created to
know and love God. Before we can love God we need to know God.After we know God we try to adhere to what has been revealed in the scriptures; teachings and laws. Loving God is a personal matter we all struggle with and it means different things to different people.
“The beginning of all things is the knowledge of God, and the end of all things is strict observance of whatsoever hath been sent down from the empyrean of the Divine Will that pervadeth all that is in the heavens and all that is on the earth.” Gleanings From the Writings of Bahá’u’lláh, p. 5
For all intents and purposes, with regards to life, meaning means the same thing as purpose:
The
meaning of life, or the
answer to the question "What is the meaning of life?", pertains to the
significance of
living or
existence in general. Many other related questions include "Why are we here?", "What is life all about?", or "What is the purpose of existence?"
https://en.wikipedia.org/wiki/Meaning_of_life
Significance is the same thing as meaning.
Meaning is assigned. People who believe in a God accept
the meaning that God assigns through the scriptures of their religion and try to live according to them. That gives us hope because we believe there is an “ultimate” purpose for our existence, something beyond mere physical survival. This is related to the afterlife we believe is the main act of the play, since it is eternal.
Nonbelievers can assign their own meanings and I would expect that they would feel hope if they are living according to meanings they assign.