God God-self does not "know the future."

Since the inception of Christianity ... there has been little but tragedy invoked in his name.

I'm not so sure. Innumerable hospitals and universities exist founded in that name; and without the services those institutions provided, humanity would be in a very different state. A friend of mine who taught school in Korea informs me that, in that country, there were no orphanages until the Christians came; no one cared for orphans.

God took a calculated risk, in doing what God did through Jesus. IMO, on balance, as per what I just said here above, it's paid off.

P.
The most persuasive case
anyone can make for one's religion
is the way one lives one's life.