True Christians will never denounce Jesus, and will praise Him to their deaths.
Psa 84:10 For a day in thy courts is better than a thousand. I had rather be a doorkeeper in the house of my God, than to dwell in the tents of wickedness.
I agree that true Christians will never denounce Jesus. Unfortunately we see many so called Christian churches that are doing just that little by little. Also with islam this doesn't matter to them. Christians that refuse to convert will either be killed or required to be a second rate citizens paying the jizya (tax that is required by non-islamists).
"Fight those who do not believe in Allah, ... nor follow the religion of truth... until they pay the tax in acknowledgment of superiority and they are in a state of subjection." Qur'an, Sura 9:29
islamists do not care how they achieve their goals. Another consideration is that they have a number of organizations (i.e. the ACLU) and politicians that are aiding them in their goals.