Let me do my best to make a series of generalizations of American Christians. Absolutely none of these instances are associated with personal or specific events, so don’t try to figure out specifics — there are none.
Our Christian teenagers are holy on Sunday, but do oral sex later in the week. When confronted they say, “Well, God knows my heart.” (I’m not even joking).
Christians claim to want to know God yet do nothing to know him better; they lie to themselves. When confronted on their spiritual passion and fervency for Christ they’ll say, “Well, God knows my heart.”
Christians — knowingly or unknowingly — will watch movies with pornographic scenes, and they’ll just sit there and watch it; they don’t even look away when its obvious what will occur. When confronted, they say, “Well, God knows my heart.”
Christians are supposed to be holy; set apart from the world around them. Yet they throw around bad language like it doesn’t matter at all. When confronted, they’ll say, “Well, God knows my heart.”
Christians seem to feel bad for the less fortunate; the homeless and lost around the world. Yet they don’t volunteer at these ministries or go on missions trips, they don’t give to those ministries, they don’t pray for those ministries. Nothing. They just pretend to feel bad. When confronted on this hypocrisy, they say, “Well, God knows my heart.”
Enough said about that. Those are obviously generalizations — they aren’t always true, but they certainly are sometimes. God looks at your heart in that he looks at your motive. That much is true. But that doesn’t mean your works don’t matter. Our salvation is a free gift and the power to live a holy life comes at the moment we receive Christ. But that’s just when our sanctification begins.
Let me do my best to list a series of scriptures of what God says he looks at:
“I know your deeds…” Rev. 2:2; 2:19; 3:1; 3:8; 3:15
“…and each person was judged according to what he had done.” Rev. 20:13
“What good is it, my brothers, if a man claims to have faith but has no deeds? Can such faith save him?” James 2:14
That’s all I can list in a short “one-liner” scripture reference. But consider the story of the sheep and the goats where Jesus rejected the “goats” from entering the kingdom of heaven and welcomed the “sheep” into His presence. The only difference between the sheep and the goats is what the did and didn’t do. Just read Jesus’ teaching!