What’s your beef with Jesus? He died on the Cross for Everyone. Those who believe(no matter what age) that He died, was buried, and rose again will have eternal life in heaven. Worthy is the Lamb! It’s your choice.
My beef would be with a strange adult coming up to my kid without my permission. I'll ask you the same question I asked someone else. What if your kid came home from the park bearing literature from the Mormon Church or a Muslim Outreach or Christian Scientists, and explained how the nice man or lady had told them all about it. Wouldn't you be a bit annoyed?