To ujm: If you have 10 men ready to start davening, and two are dark-skinned, and you think they do not count for a minyan because they are Ethiopian, what is the polite way to say to the dark-skinned men that they are not Jewish and therefore do not count for a minyan?
And if the other 8 men, white and known to your satisfaction to be Jewish, want to count the dark-skinned men for the minyan, what do you say to the 8 white Jews?
And will ujm, and everyone else, remember that Hashem knows who is Jewish, and if you miss a day of davening, that alone will not send you to gehinom. But repeatedly insulting or being unkind to anyone will increase your chances of going to gehinom.