My grandmother tried to reconvert me several times. She said she wanted to be able to see me in heaven. I asked her if heaven was a place of endless joy. She said it was. I asked her that if I did go to hell, would she still be happy in heaven.
She paused because there is no good answer to that. If she is happy, then it shows she doesn't care about me or hell is no big deal (or she has been modified so much that she is not really who she was). If she isn't happy, then heaven is not so pleasant after all.
She talked about God being perfectly good. I asked her why he would send people to hell then. After all, he could put someone into an endless sleep instead of torturing them for eternity.
In the end, she said she had no answers but hoped one day I would meet someone who had them. I commented that it shows there is a problem if she can not work out these issues with her beliefs.
Something you can say about giving money to the church is that God has no need for money. He could poof anything into existence. So money is only for the priests.
Something else to bring up is how much you can trust the Bible. For example, there is a good book called "Misquoting Jesus" where an evangelical scholar tries to find out the original text of the Bible. In the end, he basically concluded that so much has been changed, it is hard to know what to trust anymore.