My friend tells me that performing Nama Kirtan and Bhakti will only take one to another janma or the state where one will start getting into yogic discipline and the study of Vedanta could be undertaken which would eventually lead to liberation. Hence doing Nama Kirtan will only lead to the path of Vedanta Vichara and not grant Moksha. I believe in prapatti and Nama Kirtan. Which is correct?

Existence of God, Janma, papa, punya, life after death -- in all these matters, only the Shastras are to be considered the final verdict and not talent, intellect or your friend's argument. The Shastras clearly say that one can attain the highest state by Nama Kirtan alone. Any amount of other Sadhanas will not give liberation. It is only by Bhagavan Sri Krishna's grace that it can be attained. One day He will be pleased with the Nama Kirtan and provide us with the highest state of bliss.

It is said that the true form of God is unimaginable and for this reason, a few great spiritual masters (like Kabir, Guru Nanak, Shankaradeva etc.) worshipped Nama alone. Is ‘Nama’ more significant than ‘Rupa’ (form)?

Yes, Nama is definitely more significant than ‘Rupa’.

What is meaning of the word 'Bhajan'?

Involving body, word and mind in God alone is called bhajan.

Who in the world discovered the Nama?

The One who discovered the world discovered Nama too.

Though I believe, Nama Sankirtan is one of the ways to travel smooth in the divine path, I am unable to practice the same. Is there any other easy way to practice?

If you are not able to perform Nama Sankirtan, at least listen to Nama Sankirtan. Hear the Nama regularly or go and sit in a place where Nama is being chanted. That will also give you spiritual advancement.

Will Nama Kirtan help us fight the malefic effects of planets in our horoscope? But is it good to depend on astrology to take decisions in life?

Yes. Certainly. One who performs Nama Kirtan depends only on the grace of Krishna. And for the sake of such a devotee, Krishna plays football with all the planets