Synapsids, the group containing the mammal lineage, are no longer considered to be reptiles. If they were reptiles, then we’d have the fish problem all over again.
Reptiles are all Sauropsids, which diverged from Synapsids about 300 million years ago.
So if Synapsids are your parents, then Sauropsids are your aunts and uncles, and reptiles are your cousins.
I was raised in an evangelical christian family. My take is that evangelism is tied to redemption. The evangelical message is to accept redemption and repent. In a weird twist, the greater the sin, the greater the redemption. If you aren’t a top tier sinner, you’ll never get top tier redemption, and all the cred that goes with it.