Check wrote:

"Since Maharaji and his father were alive at the same time, who was "the current incarnation of God"?"

This was a major confusion for me all the time I was a premie (1972-1983).  How could God be a devotee of His father?  It didn't make sense.

The general understanding at the time was that his father, Shri Hans, was nearly God but not quite, while Maharaji was actually God.  So until young Prem came along, people made do with an 80% incarnation of God.