There are many Rabbis who are trying desperately to prevent “Jews” from becoming Christians.

 They are trying to keep alive those who are not viable enough to remain Jews. I don't agree with them. We certainly have to protect Jewish Children from missionaries. But if, as adults, some wander off, it is better to let them go.
We Jews must accept that some "Jews" are born so morally weak and whose character is so frail that they will die, as Jews, before making the complete journey. Some of them will become Christians.
Just as no fish can be fooled that alcohol is water, so no real Jew can be fooled that Christianity is our true Tradition. Those who leave never were Israel.
The time of the separation of the wheat from the chaff has come. I am not glad to see that so many "Jews" are becoming Christians, but I understand this is a necessary phase in our ultimate Aliyah because the weak of every species must fall away. This is the way of survival of the fittest. If someone is not strong enough to make the full arduous Jewish journey, they will remain at the level that they can handle.
If "Jews" become Christians they never were meant to be Jews. They may have had the merits of their Ancestors that gave them a chance to be Jews, and so they were born Jews, but they never had the strength to make it to the top of HaShem's mountain and we should accept their leaving Torah with the relief of good riddance. They would have been a millstone around our necks and would have made our journey harder. Let them go. We know they won't find Peace. They will find whatever substitute for Peace is enough for them.
The truth is, the Rabbis likewise have embraced the Talmud, laced with Babylonian influences as it, because they too could not hack the full force of real Prophetic Torah.