Hello, i am a real Christian

[Darwinian]

Statistics: Out of all the religious organisations that there are, one of them has to be the oldest. The fact (and that can be disputed) that christianity is the oldest organised religion, simply means that christianity is the oldest organised religion, and nothing else.

Psychology: Because you believe that your religion is the true religion then it is only natural for you to latch onto a fact like this and try to use it as some sort of demonstration for the validity of your belief.

Reality: But of course, christianity is certainly not the oldest religion in the world, regardless of the fact that yours has a single headquarters, and people of older faiths can make exactly the same claim as you as I'm sure that, for example, the Jews would claim that they are pretty well organised and have been around long since the idea of christianity.