For your own self-designation, begin with the broadest most relevant category and call yourself a Humanist. This classification encompasses all others.
After the word Humanist you may add your preferred subset label: Humanist Muslim, Humanist Christian, Humanist Buddhist, Humanist Atheist, Humanist Agnostic. It is important that these subset terms do not precede the word Humanist. We are Humanists first, and what we are after that is secondary or tertiary or even further down the line.
We are Humanists first because we are human infants first, insusceptible of further branding at that time. No infant is Muslim or Christian or Atheist or Conservative or Liberal or even American or Dutch or Egyptian or any of the like. An infant is simply human, inducted by that condition into a decades-long participation in basic human goods, chief of which are friendship, play, learning, skillful performance, and the rearing of children.
We are Humanists first because Humanism is easiest to believe. There are no fabulist doctrines to embrace. No winged ponies. No uncertain nativities. No staggering saintly pedigrees. No post-possession recoveries. No impracticable moral embargoes. No otherworldly rules on textiles that drape the body. No deistic dietary whims. No lurching angels trumpeting doom. No hellish underworld chambers brutalizing dissent. Humanism says simply that human ingenuity is the source of goodness and therefore a source of delight. Easy assent.
We are Humanists first because with human tools we attempt the anatomy of human destructiveness to better ourselves and shed our vices. With human means we devise the ethics of urgency to rapidly contain any rapacity that seeks to harm the elements and the animals.
We are Humanists first because we cannot be reduced to anything smaller than the human, as we cannot be elevated to anything larger. Even the posthuman and the transhuman are but species of the human—and from the human all the metrics of morality emerge and extend to bonobo and cyborg alike.
For what you call yourself, begin with the broadest most relevant term. When someone asks ‘What are you?” say ‘I am a Humanist.’ Search and see what the word has meant. And as you understand it, receive it first and foremost. After this, if you must, you may array yourself with any other supplementary hue on offer. But start with Humanism.
Featured image ‘Sea of humanity’ by Sholeh Munion via Flickr