Dealing with anti-Islam propaganda while planning to marry a Christian sister

Assalamu alaikum, I need some advice. I reverted to Islam a few months ago after being raised Catholic, and my Christian girlfriend and I have been together for about a year and a half. We want to get married soon, inshaAllah. She’s been supportive of my conversion and even felt inspired to grow in her own faith-she went to a Christian convention recently. But when she told her religious parents about me becoming Muslim, they hit her with all the common lies: that I’m lost, going to hell, Muslims beat women, they kill non-Muslims, stuff like that. Her friends seemed fine at first, but then her friend’s dad sent us a video we “had” to watch. It’s called “The History of Islam in 68 Minutes” by some guy connected to evangelical networks, PragerU, and groups like that. I looked him up and it’s clear he’s heavily biased-he’s made claims that if atheists took over they’d kill millions of Christians, and says Muslims aim to infiltrate, breed, and dominate by the sword. I explained this to my soon-to-be wife, and I’m not worried about myself-I’ve studied the arguments and can handle it. What scares me is that this constant propaganda will drive a wedge between us in our marriage. How can we protect our relationship from all this hate and misinformation?