Bismillah, 

Asalamu Alaykom, 

When our jurists produce religious rulings, they have done so based on  the religious sources and principles. This is  according to their best efforts. It could be that a jurists’s ruling in reality isn’t correct, however the jurist exhausts his upmost efforts to produce something that they think is closest to the sources. 

Therefore, even if a ruling wasn’t correct in reality, someone wouldn’t be accountable as he has only followed this jurist’s ruling while considering him to be a qualified expert in Islamic jurisprudence. 

When it comes to one’s own theological beliefs such as proving God, they must establish and prove this for themselves and can’t just say: “A scholar told me to believe in God so I do so”. 

May Allah grant you success