If you dont believe and you are right you have lost nothing.
However if you don’t believe and are wrong you have lost everything.
There is absolutely no down side to believing and never-ending downsides to not believing
Pascal in the 17th century took your premise and created an equation to show that belief in Christ and living your life that way was mathematically the best direction your life should take.
Hebrews 11:1 -- "Now faith is the substance of things hoped for, the evidence of things not seen."
I have seen Jesus' work.
I don't believe in Jesus.
I KNOW Jesus.