Anyone who comes to this forum comes into contact with several authentic Indians..If the new poster has Indian blood, he or she also is authentic Indian. Whether he or she identifies as such or not. That is up to the individual.
What new posters do NOT come into contact with here is any pureblood Indians..
If there are any pureblood Indians left, they are not among the 5 Tribes that mostly get mentioned here..nor among the posters to this forum.
One cannot be authentic Indian if he or she has no Indian blood..
One with any amount of Indian blood cannot claim to be authentic Indian while proclaiming anyone else with Indian blood to be NOT authentic.. That's so silly..