*Beware of controversial issues within*

I tend to think a lot when I'm laying in bed trying to fall asleep.  Most of the time, I just can't turn my brain off.  I hate it most of the time, but last night, I came upon a conundrum that I have not been able to get past.  Yes, I know this is a controversial issue, and I'm not meaning any disrespect by this (those that I've already spoken to about this topic know this already).  So here it goes:

God is always described as omnipotent.  This means he's all powerful- power over everything.  He can create, he can destroy, and so forth and so on.  And everyone always says that God has a divine plan (you mostly hear about it when someone dies- "It was all part of God's plan").   If this is true, then the statement that God gave us freewill is false.  Because if we truly had freewill, then God would be unable to have said plan.  We'd continually mess it up for him.  But since he's all knowing and all powerful, he would already know how we were going to screw it up, making the mess ups part of his plan too.  But then if he knew it was going to happen, then how can it be a mistake?  It was part of his plan.  Meaning that our freewill isn't really freewill, and everything we do is just part of his plan.  How does that work?

And in the same sense, since every death is just a part of God's plan, then every baby that is aborted is part of his plan.  He "blessed" the mother with the combining of sperm and egg, and he knew the exact time that baby would die, because everything is part of his divine plan, right?  So, why are so many people against it?  It's part of God's plan, if you think about it.  If it wasn't part of God's plan for that baby to die, then it would've survived (which doesn't happen very often) or the mother would have gotten some divine inspiration and changed her mind.  God knows full well what's in the hearts of the women who abort, right?  He's all knowing.  By letting her get pregnant, he already knows she's going to abort.  How is it a sin or murder to do it, then, if that's what God already had planned?

This is something that bothers me.  I can't seem to find a reasonable explanation for it.  I like reasonable explanations.  But this is a conundrum to me.  I can't find a way out of this one, and that bothers me.

(Side note:  For those of you who may not know, I'm not a believer in the God of Abraham- meaning the God of Jews, Christians and Muslims- and these are serious questions.  My husband can't answer them for me- he's a devout Christian- and I'd like to know if anyone else has any ideas.)