I am a humanist because human beings are more important than dogma and traditions. >>> Those people for whom dogma and tradition are important may have them, of course. Please recognize that not all other humans accept them.
The fact that you can have an absolute like "true morality" requires that there be a standard of morality. How is there a standard if there is no God? If a supreme being is not in the picture, there can be no morality at all.