I am not a practicing Muslim, but can offer you my opinion on some of your post. First, Islam, like Christianity, is not based on race, and is not racially exclusive. This is not to say no Muslims ever engage in racist behavior or attitudes, but the religion as it has been traditionally practiced, does not exclude based on race.
as for circumcision... i know this topic has come up quite a bit. can't find those old posts now, but here is one article that shows that there is some nuance on this issue: