What unifies people today, or maybe better said: what could unify people today, is shared cherishing of ideas and values like secularism and humanism.
As all world religions have been given by God so we can share Love for each other in practicing virtues, if a religion has forgotten this aim, then yes, it is better to have no religion.
The only way the world will find peace is rediscovering that God given love and virtues. Man can not do it alone.
I see many do still hold to love and virtue, they just have to find a common path, a path that has been lost.
Regards Tony