Difficulty in introducing a close friend to christ

Me and my best friend of 3 years have lately been arguing over the bible. He is an atheist, im a Christian, he tries to bring up “contradictions” in the bible that i constantly disprove, but some questions i simply do not know the answer too. I don’t know why god created us knowing we’d sin, i don’t know why god lets good people die horrible deaths, and so in the end all i can do is pray and ask the lord to encounter him in someway. Like he did for me. But is there anything else i myself can do?