Discussion points to help parents in a faith crisis

My parents have been on off a faith crisis for last few years. In the last 12 months they have been investigating catholicism and are going to get baptized next week. Is there anything you can send me to forward to then why their decision is wrong, I feel they are being led astray by Satan, they keep quoting Matthew and how the Christ wouldn't let the church fall and that there is no real evidence for the great apostasy. They also quote the succes of catholism counting more than 1 billion members versus the lds insignificant 27 million members. I think the new pope has bedazzled them too. It's all very concerning. I just lost my only sibling to Evangelism earlier in the year and this will result in me being the only member in my family.