You must understand that the task is of changing a mindset, metanoia, making people 'born again', accept a new world view.
Also understand that the urgings can be understood AND rejected:
1 Corinthians10:
1For I do not want you to be unaware, brothers and sisters, that our fathers were all under the cloud and all passed through the sea,
2and all were baptized into Moses in the cloud and in the sea,
3and all ate the same spiritual food,
4and all drank the same spiritual drink. For they were all drinking from the spiritual rock that followed them, and the rock was Christ.
5But God was not pleased with most of them, for they were cut down in the wilderness.
6These things happened as examples for us, so that we will not crave evil things as they did.
7So do not be idolaters, as some of them were. As it is written, “
The people sat down to eat and drink and rose up to play.”
8And let us not be immoral, as some of them were, and twenty-three thousand died in a single day.
9And let us not put Christ to the test, as some of them did, and were destroyed by snakes.
10And do not complain, as some of them did, and were killed by the destroying angel.
11These things happened to them as examples and were written for our instruction, on whom the ends of the ages have come.
Relevant texts dealing with different aspects of the topic are:
Isaiah 55:2, John 6:27, John 6:32, Psalms 78:19!
Conversion requires the converter to be himself converted. Many so called Christians aren't themselves converted. You wouldn't charge an alcoholic to convert another alcoholic, would you?