In Muslims, we witness that people belonging to a certain sect would consider in their hearts that the other person, of a different sect is not going to please Allah with any of his/her deeds. At extremes, even considering someone a non-believer, God forbid. We are all Muslims, and in no way can we put a stamp of a believer / non-believer as a result of the sect one belongs to.
True Islam believes in diversity, equality, brotherhood, and has no room for racism or bias on the basis of color, gender, ethnicity or background etc. Islam is a religion of peace and is a blessing for all mankind, allowing them to see hope at the end of a dark tunnel of suppression, injustice and hatred, maintaining an equilibrium of sanity and composure.
Being humble in your prayers and supplications and trying to please Allah brings a feeling of contentment and peace in our hearts. When we know that we are doing everything in our power to please our Creator, then an environment of humility and serenity prevails. Of course, we are responsible for fulfilling our roles as a fellow being to ensure that no soul is hurt or harmed by us.