Let's make one thing clear,
Islam is not the religion of equality, it's the religion of justice.
“Verily, ALLAH enjoins Al‑‘Adl (i.e. justice)”
[al-Nahl 16:90]
So if someone claims to be a Muslim and believes Quran to be the speech of ALLAH swt', he/she should bow before the Hukum of ALLAH swt'
“ALLAH commands you as regards your children’s (inheritance): to the male, a portion equal to that of two females” [al-Nisa’ 4:11]
Why this share, ALLAH swt' knows the best.
“Should not He Who has created know? And He is the Most Kind and Courteous (to His slaves), All‑Aware (of everything)” [ al-Mulk 67:14 ]
Still if someone is not content with the distribution ordained by the kings of the kings, ALLAH swt', than he/she is free to change the path, as there's no compulsion in religion.