I feel a lot of times atheists get bogged down arguing the particulars of a religion. While this can be fun sometimes, it can be extremely aggravating as it gives the religious a lot more room to wiggle out of things, redefine terms, move the goal posts, be vague, etc. The way I see it, all of the arguments tailored to their religion can easily be nullified by attacking the source: the existence of god. If you can shut them down here, then it doesn’t matter what some book says, or what they feel in their gut, or what a friend told them. Every single argument they could make about their religion depends on the assumption that god exists.
The simple fact is that there is no evidence for the existence of god; all they have are logical fallacies, appeals to emotion, and “god of the gaps” arguments. With the null hypothesis, burden of proof, and Occam’s razor all in your favor, their claims fall to the floor. Just keep asking for evidence at every turn. For example: “Well who made god?” “Oh, he’s eternal and outside time and space, the law of cause and effect doesn’t apply to him.” “Oh, that’s a convenient ad hoc fallacy. What evidence do you have that god, if he/she/it hypothetically existed, contains those traits of being eternal and outside time and space?” At this point they probably will come at you asking “well who made the universe”, which assumes several things, but you can point out that the way the universe operates, it would be able to create itself without the need of a god. The idea that it’s ok to say “I don’t know” really baffles believers. Uncertainty scares them, hence why they cling to the false certainty and security of faith. Point out that we don’t have all the answers right now, but that you’re willing to work to discover them rather than throw up your hands and declare “god did it!”
If you can master these macro arguments and keep asking for evidence every time they claim god has X,Y,Z attributes, all the micro arguments about the bible’s validity, or Jesus’ divinity, etc, don’t matter at all.
(Note: this isn’t as well worded as I would like, so I’m probably going to edit this, but I just wanted to get this out there before I went to sleep. I’ll fix it when I’m no longer exhausted)