Just to be clear I wasn't suggesting Plato was responsible for the Gospels.
As a personal project, I'm collecting relevant information regarding the religious and ethical climate of the early days of Christianity. Every Christian is aware of how today's forms of Christianity are in part an adaptation to the age we live in. Some embrace change others get dragged along, but change comes either way. The Reformation was in a large way the product of political struggles, increasing literacy and scientific progress. The faith grew differently in different soil. Similarly, the Second Great Awakening of the 19th century (WT included) was triggered and fostered under a new spirit of individualism and socio-economic change.
In the same way, the so-called intertestamental period events and cultural pressures spawned new ideas about God and salvation. Some of these ideas are very surprising. The more we learn the less surprising the birth of Christianity becomes. No religion is an island.