Some of the Meccan idolaters suggested to the Prophet as a compromise that he should worship their gods for a year and they should worship his for a year. This was the reply.
In the name of God, the Lord of Mercy, the Giver of Mercy
Say, Prophet, "Disbelievers: I do not worship what you worship, you do not worship what I worship, I will never worship what you worship, you will never worship what I worship. You have your religion and I have mine."
* statistically, this is the case. Few conversions ever happen across religious lines. It's always the outliers that cross over. Of course, Christians still believe we have to try.