Spiritual growth and time

Pastor Ed brought up a piercing example during Sunday's sermon- that when you have little time for spiritual growth, you ultimately have little time to research answers to answer questions/doubts many atheists bring up:

Remember that question your friend asked you long ago: "Why does God allow babies to die?" The question that you still don't have a good answer for because you never HAD the time to look this answer up in the bible or through apologetics such as The Reason for God or Letters from a Skeptic.

I remember my best friend asked me once "If this idea of Christianity is so true, so good for humanity, then why doesn't everyone believe right now? Why?" I remember I had no good answer for it.

Then I remember she also asked me once "What about the people of this world before Jesus came to save us and die on the cross? Were they not saved? Huh?"...I also didn't have a good answer for it.

Then I remember my other best friend asked me once: "I hate the way religions keep warring against one another. It feels like all you're doing is competing against each other and arguing "My God is better." That's stupid...that's why I'm agnostic. I believe there's someone higher up there, but I don't believe He exists in any one of your religions." I didn't have a good answer for that.

A friend asked me once: "I don't get this trinity thing, how can God be three things at once? It all sounds so fantastical to me- like some sort of fable. Seriously, what is this God = Jesus concept? Wasn't Jesus God's son? How can He be God....and the son....>.<

But as I'm reading the bible more now, praying more, growing more, reading apologetics...I'm starting to see the answer to all my friend's questions; if they ask me these questions now (2 years later), I can answer with more assurity. But I can't believe it took me 2 years to realize this. I hardly talk to any of them now. I'm so ashamed. Oh how time flies!

Love,
Lily

P.S If anyone shares the same doubt as my friend's, tell me! I'll provide a good answer for you! I promise!