Will God forgive me if I don't ask my athiest friends to repent?

Yes. If you believe in Jesus for eternal life, then you are forgiven all sins past and future, and you will be in heaven. Not asking your atheist friends to repent, is not a sin anyway. And also, nobody can get to heaven by "repenting". The only way to heaven is by BELIEVING IN JESUS.
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Jesus loves you and wants to bless your life freely :) Most of all, Jesus wants you with Him forever, and not in hell. The truth is that every belief except one will lead to eternal torment in the lake of fire for every person. Because nothing pays for our sins except the death and blood of Jesus, the sacrifice of Jesus that is already accomplished by Him . Jesus loves you! The truth is that Jesus is God, and Jesus died on the cross to pay for all of our sins in full, and then Jesus resurrected from the dead. Nothing else pays for our sins, not works, not deeds, not religions. So the only way to heaven and to avoid hell, is by believing in Jesus for eternal life (John 6:47), without adding any of your own works (Romans 4:5). Believe in Jesus to take you to heaven, and you will be in heaven, no matter what, guaranteed. That easy, thanks to Jesus! Tell Jesus that you thank Him that you will be with Him in heaven when you die, because you believe in Jesus! It is too late to be saved, after death

All gods are myths, don't let a fear based religion ruin your life.

Chris gave you the right answer.

Death leads to heaven or hell, and the only way to get to heaven is to trust in Jesus Christ as your Savior. Jesus loves us so much that He died on the cross to pay the complete price for our sins and came back from the dead (1 Cor. 15:3-4). He promises everlasting life as a free gift to anyone who simply believes in Him for it! No one can be saved by good works. Eternal life is received by grace alone through faith alone in Christ alone (Eph. 2:8-9).

"Verily, verily, I say unto you, He that believeth on me hath everlasting life" (John 6:47).

Your atheists friends will not forgive you if you do. It is THEIR life, not yours, so MIND YOUR OWN BUSINESS.

Good trolls are at least ALMOST convincing.

It's not your fault they're atheist. And no, you shouldn't ask them to repent. Why? Respect each other's opinions and beliefs even if they aren't the same as yours. Their beliefs are okay and long as they do not restrict you from having your own beliefs.
God isn't calling you to ask them to repent. God is calling you to treat them the same as any other according to their beliefs. The Christian religion was not meant to convince and convict people because they did not believe in God. The Christian religion was meant to be a path for those who choose to follow God. It is simply a path for one to choose, some people choose it and other's do not; that's all completely fine.
I'm agnostic so you can disregard this or not. But I do read the bible and research the Christian religion and it's counterparts. When I was Catholic I felt compelled to convert people. It backfired and I regret it because I was ignorant about it. The best you can do is pray for them.

May God's blessings be with you!

No.

God will not forgive.
Just as Batman will not forgive.
Remember, Batman protects you from criminals, but he nevers forgives.

He probably wouldn't forgive you misspelling 'atheist'.

But that would obviously be a pointless exercise.
As atheists do not believe in God, we have nothing to 'repent' for and no-one to 'repent' to.