Here are 7 principles for arguing against the heresy of Calvinism courtesy of Randy Siever. You can view Randy’s video here, in which he explains these essential principles.
1. Make sure you have misrepresented his (the Calvinist’s) position so badly that even he wouldn’t recognize it as what he actually believes.
2. Have a handful of proof texts you can use against their arguments.
3. Never ‘exegete’ passages of scripture in order to draw out what the human writer and Holy Spirit actually wrote.
4. You always want to share a part of the truth as if it is the whole truth and pretend that Calvinists don’t believe the part of the truth you stated.
5. Find areas where most Calvinists would disagree with Calvin and insist that they must believe everything Calvin had to say if they are really Calvinists.
6. Never quote a Calvinist in the context in which his comments actually occurred.
7. When all else fails, resort to name calling.
I encourage you to watch Randy’s video, available here.