Clearly, you do not view all religions as the same, as you specifically target only one - Christianity. You have not started any threads complaining about any other religions.
The First Amendment guarantees freedom of speech. Please show me where it refers to taxation - there is none.
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
Here's a good article for you to read: 
http://en.wikipedia.org/wiki/Freedom..._United_States
Basically, you will see that religion and taxation are not affiliated with freedom of speech. Your concept that religion and taxation should be used to control the ability of individuals to practice their First Amendment right of freedom of speech is not only unconstitutional, it is against the very grain of what this country was founded upon, and if you feel that you need these constraints to be happy, I suggest that you move to a country that has these constraints - try China, Russia, Burma, etc.
Tax Exempt status comes form the IRS guidelines - not from the Constitution, which is the guideline of the law. The IRS is not tasked with creating the law, and cannot have any say concerning individual rights, that is the job of Congress. Your "facts" are incorrect, and your very concept of how the system works shows that you did not grasp the basics in civics class.
Now, personally, I have no problem with removing tax exempt status from EVERYONE and ALL organizations. All individuals and organizations use the common services provided by revenue gathered through taxation, so all should pay into the same system. We are all protected by our Armed Forces, we all use the fire and police departments, etc. That is very different than tying freedom of speech to taxpayer status.