When I was a Christian and I experienced the same questions and doubt about God, Jesus, Mary, resurrection and other things most Christians have. Primarily I was taught and told that many of the answers lied in a question of faith. When there was no real proof there would be and should be faith. I had little trouble at all accepting "love of your neighbor, care for the poor", the avoidance of greed and the lessons Jesus taught. Over time I saw more organized emphasis on who Jesus was and less on what Jesus taught. To me the lessons Jesus taught took a back seat to the worship of trivia and minutia of the bible rather than the lessons within.
I would imagine focus on ritual and religious text and trivia is inherent to all religions. It certainly happens in Buddhism. It probably happens in Islam. That's not to say it occurs with everyone in every religion. I would say that it is common practice, however.
There is a story in Buddhism that applies well to Christianity and perhaps to Islam and other faiths. Rather than tell the story, which I would surely butcher, I'll paraphrase.
People find themselves on the shore of a land that is harsh, often brutal, hateful, unfulfilling and not peaceful. In the distance across water there is a land that is not harsh, a land that offers fulfillment, the opportunity of peace, a land where there is love and compassion. Seeking to live in that land people build their individual boats to cross the water. For many the boat building is not an easy task, but they complete their boats and set out for the better place.
Once people arrive in the new land they find that they can in fact enjoy peace, fulfillment, love and compassion. Many people no longer needing the boats they made they leave them to begin focusing on living in the manner in which they longed for. They begin to work on peace, fulfillment, love and compassion. Others have become so attached to their boats that they continue to carry them on their backs wherever they go. The boats are a hindrance and a burden on land. The boats greatly slow the progress of the people who insist on carrying the boats around on land. For them true peace, fulfillment, love and compassion is hindered by their attachment to the boat.
If Jesus was not crucified and resurrected would it change the lessons of peace, love and understanding that Jesus taught? I never have believed that it would. I do believe that some Christians obsess over it and pay less attention to lessons Jesus taught.