>>509638486
If believing was easy then there would be no glory in believing God. I think it also shields us a bit from sin since we have to a certain extend plausible deniability.
There is a lot of historical evidence for Christianity but the main focus of Christianity isn't to be easily provable, it is to redeem God's creation and glorify him in the process. To create a situation where we can choose him despite being tempted not to. Such a scenario requires doubt, because God is such an obvious choice he has to be concealed. Something like that.