AK_M_f You ask whether the concept of freedom is in the Bible. I would say it definitely is; for instance, Jesus said,
"If the Son has set you free, you are free indeed."
Christianity has had a long tradition of internal debate. Theology was, after all, defined by Councils, where debates took place. Christians attribute the consensus to the activity of the Holy Spirit, who was sent to guide the Church into all truth. If you access most Christian website, you will quickly learn that Christians debate among themselves (on the minors, not the majors), and that kind of debate can be very healthy.
Now, on the other hand, I would say that Islam may not have that same tradition of free exchanges of ideas and concepts pertaining to theological doctrine. That is why you will not generally see this kind of give and take among Muslims and Non-Muslims on Muslim-owned websites. You will see it,however, on Christian-oriented sites. That's just the way it is, I suppose, and I don't think there is going to be any big break-through in dialogue in the near future.
Of course Muslims believe they are right, and Christians believe deeply that they are right. However, Christians don't usually make remaining a Christian a matter of physical life or death (at least not in this era). I believe that "freedom of religious expression" is a Western concept, and of biblical origin. For instance, when Paul spoke of heretical teachers, he never condemned them with a death sentence - he simply said, "anathema." Surely, Jesus never taught any compulsion in religion - in fact He taught exactly the opposite: "no man can come to Me, unless the Father draws him."
This Christian view is evidenced by the Calvinist system of theology which speaks of election from the foundations of the earth.
So, this is my view on the matter, A