We will have to live with the consequences of everything we say – what we say can preserve life or destroy it; so we must accept the consequences of our words.
There are many, many, sincere people who champion a rationalist, humanistic, worldview. They present convincing logical arguments that lead to the conclusion that there is no life after death. However, not asking what the consequences are of their beliefs, they almost universally stop at the point of “disproving” life after death and simply assume that a purely physical lifetime has meaning. In trying to apply rational thought to reject the non-physical they accept the existence of existential meaning in physical life without critical analysis and a logical foundation.