Allah, the Exalted, says:
"But if they repent and perform As-Salat (Iqamat-As-Salat), and give Zakat, then leave their way free. Verily, Allah is Oft-Forgiving, Most Merciful.'' (9:5)
Its a common practice among muslims to judge aqeedas of other muslims and cast fatwas of kuffr on them...