This claim is Not acceptable at all. Allah, The Most Exalted, The Most Merciful, The Most High will never be united with any one neither in this life nor in the hereafter. Allah says in Quran : There is nothing like Him. (Sura 42, verse 11.
Ameerul Mo'mineen Ali (AS) said: Allah is much higher than mixing or being similar to His creatures وتنزّهَ عن مُجانسة مخلوقاته.