With that lead-in I offer the following observations:
When preaching on the universal salvation offered by God through Christ, who breaks down barriers, as exhibited by today’s Gospel, you must be careful not to veer off into universalism, even by implication, or just plain sloppiness. Preaching on certain things requires the preacher “to do” theology. When you choose to preach on a theme, like the universal salvation offered in Christ, please do your homework.
Not everyone who has died is in heaven. As Catholics, in addition to heaven and hell, we dogmatically believe in Purgatory. Also, the Church is the ordinary and normative means of salvation. Hence, the Church, baptism, the Eucharist, are not incidental to anyone’s salvation, even those who might be saved extraordinarily. Let's assist each other in avoiding the trap of presumption. The Canaanite woman is a great model for not being presumptuous, by-the-way. Her humility, persistence, and love presents us a great reason why we need to ground our theology in Scripture rather than trying to use Scripture as a jumping-off point for our theological pre(mis)conceptions.
Frankly, I fail to see the efficacy of pointing people away from Christ’s Body, the Church.