If I call myself a Hindu, is it an advantage to me?

Not at all. Calling oneself a Hindu is about as advantageous to the self, as calling oneself a Christian, a Muslim, or Mr. Smith. These are merely bodily designations, and bodily designations are of no importance to the self.

As long as we don’t come to terms with who we really are, ie. the soul within, we will continue the hard struggle for existence in the material world, life after life.

I may think it’s an advantage to me, if I’m rich and famous, but if, in the course of such a glamorous life, I commit so many sinful activities, that I end up as a dog in my next life, what’s the advantage?

So, in reality it has no significance how we designate ourselves, what’s important is how we act in this life, and what kind of mentality we cultivate.

Sri Chaitanya Mahaprabhu says:

"Bhakti, or devotional service, means engaging all our senses in the service of the Lord, the Supreme Personality of Godhead, the master of all the senses. When the spirit soul renders service unto the Supreme, there are two side effects. One is freed from all bodily designations, and one's senses are purified simply by being employed in the service of the Lord.”

—Verse quoted by the Lord from Narada Pancaratra