I have found that some Reformed believers think TULIP belongs in category 1. Yet, they also say that there are Arminians such as John Wesley, who are/were true Christians.
If this is true, wouldn't it be placing TULIP in category 2?
1. I agree with the unanimous decision of the Synod of Dordt... Arminianism is a damnable heresy. Those who embrace it in their hearts are unsaved.
2. The vast majority of professing Christians today are NOT Arminians but semi-Pelagians which is even more damnable, if that is possible.
3. I'll leave the math to you.

4. Good article here that is most applicable:
Pelagian Captivity of the Church. Another article which highlights the crux of the matter; that salvation is by grace ALONE and not by grace + works can be found here:
By Grace Alone?.
5. If Arminianism is relegated to the category of "important" but not "essential"; #2, then if one was consistent, then ALL aberrant doctrines, including those that deal specifically with salvation should be included, e.g., Federal Vision, neo-Orthodoxy, Catholicism, etc. Personally, I reject any such notion.

Justification: "If the purity of this doctrine is in any degree impaired the Church has received a deadly wound and brought to the very brink of destruction. Whenever the knowledge of it is taken away, the glory of Christ is extinguished, religion abolished, the Church destroyed and the hope of salvation utterly overthrown. - John Calvin "The Necessity of Reforming the Church" p. 42