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If Christianity cannot present evidence that the soul is immortal, then they have nothing to offer the masses, eternity in heaven with God or hold over their heads suffering forever in hell. They need the immortality of the soul. I did my research, it's not in the Bible, so what do they do? They relied on Judaism, which has always believed in the immortality of the soul. I start checking on that and I look in the Judaica Encyclopedia and what do I find? Their remark that Judaism probably got the immortality of the soul from the Greeks, so I go back further, where it all started with Plato.

Source: www.cyinterview.com
If Christianity cannot present evidence that the soul is immortal, then they have nothing to offer the masses, eternity in heaven with God or hold over their heads suffering forever in hell. They need the immortality of