Islam's major bad points:
1. Sends Muslims to Hell because works righteousness doesn't work;
2. Is violent, even though it has Muslims buffaloed into thinking it is not violent;
3. Makes people angry with Muslims so that they kill Muslims at times;
4. Keeps Muslims in the dark ages in the ways that they live.
Islam is not good for anybody, but especially not for Muslims. Muslims would be far happier if they became Bible believing Christians. (So would atheists.)
Did you try a relationship with God (Father, Son, and Holy Spirit) when you tried Christianity? Trying to do something doesn't cut it. Doing it is what cuts it. God is there for you if you have the relationship with Him.
People who think that their religion of non-religion isn't a religion, are only deluding themselves. Come to a relationship with God. Get into the Bible and get the Bible into you. It may not be easy to stick with God, but He will help you if you are serious.