I know that devotion to Krsna is old (though definitely not as old as the Vedas) and has never been influenced by Christianity, Islam, or Judaism (I never referred to Buddhism in this connection). The differences between the personal and impersonal are relatively vague, but adopting this distinction for simplicity, I expressed surprise at seeing people who have grown up in a Western culture which stresses the personal take to an Indian cult which does the same. I am less surprised when people who are dissatisfied with Western monotheism take to an Indian philosophy which stresses an impersonal absolute.
The Exchange between Srila Prabhupada and Dr. Staal, 23 January, 1970