Can Christians reject Jesus Divinity (not god) and be saved?

In my chruch i believe that jesus divinity is crucial for salvation. but I have questions and doubts

1) What if the chritians believe jesus atone for their sins, died on the cross for their sin while believing he is not god?

2) what if the Christian follows christ truly and is not a worker of lawlessness, trying to obey command.

3) what if he or she truly believes in christ and his death ?

4) did the robber on the cross believe in Jesus divinity?

Thoughts?