was Mirza Qadiani law-bearing "Prophet"?

[حمزہ]

Muslims do belive Jesus AS is alive and He AS will landback near to Qiyyamah. Qadiani cult do belive having faith Jesus AS is alive and He AS will return too is Shirk. My question to Qadiani fella is when having mentioned faith become Shirk? Was it Shirk at the time of Holy Prophet SAW? or Mirza Qadiani Wahi declared it Shirk?