I think the problem is the perspective. Some people think that being baptized makes a person a Christian where the Bible requires faith in Jesus. On the other hand, having the church/saints bless a child, agree to do everything in their power to lead them to Christ, and to understand how God can bless a family or other group even when not 100% are true believers is reality, too. I'd argue that it isn't the action that matters but the purpose/belief that matters.

1 Corinthians 7:14 (NASB1995)

For the unbelieving husband is sanctified through his wife, and the unbelieving wife is sanctified through her believing husband; for otherwise your children are unclean, but now they are holy.