Had God willed, He could have made you one congregation. But He sends astray whoever chooses to go astray, and He guides whoever wishes to be guided.* You will surely be asked about everything you have done.
وَلَو شاءَ اللَّهُ لَجَعَلَكُم أُمَّةً وٰحِدَةً وَلٰكِن يُضِلُّ مَن يَشاءُ وَيَهدى مَن يَشاءُ وَلَتُسـَٔلُنَّ عَمّا كُنتُم تَعمَلونَ
wa law shaaa’al laahu laja’alakum ummmatanw waahidatanw wa laakiny yudillu many-yashaaa’u wa yahdee many-yashaaa’; wa latus’alunna ‘ammaa kuntum ta’maloon
*16:93 God knows the sincere believers among us who deserve to be redeemed. Accordingly, He guides them, while blocking out those who choose to disbelieve.