New devotees should be told that the Christian preaching is already there; so if they are attracted by Christianity, the Christian Temples are there. When one comes to the Krishna Temple, he should try to understand krishna Consciousness. Actually, one who is advanced will not find any contradiction. The Christians teach love of Godhead, and we practically do it.
So one has to understand from the practical point of view. A man is judged by his activities. We see that they are engaged in smoking habits, eating meat and indulging in free mixing of boys and girls; these are not the activities of religious persons. Lord Jesus said and the Bible also says, "Thou shalt not Kill." But they are eating meat. So we must see practically if someone is leading a pure life and not be blinded by some sentiment. Our students are strictly observing the four rules or restraints from impure habits and they are factually living according to the highest standard of religious life. So we are actually following the principles of pure living in Krishna Consciousness, but it appears that these followers of the Christian philosophy have fallen down from the transcendental platform.
So one must be pure hearted. And if they are still inclined to remain Christian, they can go. There is no need of raising controversial points and thus wasting each other's time.
There are even different political groups and one group does not go to the other group to preach their tenants, but they have got their own camp. Besides that, when we perform our Kirtana in our home or Temple, nobody can legally disturb it. I hope this will clarify the situation.