Why is atheism a rising trend? There is very little focus on what God has already given us in the Bible.
As a God who said, For I am the LORD, I change not (Malachi 3:6), He will not contradict Himself. If God tells us anything, then it is sure. So, if they speak not according to this word, it is because there is no light in them. (Isaiah 8:20) If we would encourage people to go to the Bible for what God wants us to do, they could see for themselves whether they are following God or not. More than that, they can see what others do and compare it to what God has given us to see if they are also faithful. Paul tells us to do this when he says, Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth. (2 Timothy 2:15)
Amos 3:7 tells us that, Surely the Lord GOD will do nothing, but he revealeth his secret unto his servants the prophets. Need proof that the Bible holds the word of God? The prophecies can help with that. Actually, prophecies make up over 20% of the Bible (27%, if I remember correctly). While most are in the Old Testament and applied to various judgments that God passed on Israel, books like Daniel give something more relevant. For example, Daniel 2 predicts over 1000 years of time. It isn't a vague one either; Daniel clearly explains the start point (head of gold = Babylon), what would come next (chest of silver = Medo-Persia), and what was to come (a later chapter reveals that after Medo-Persia, Greece was the next empire to come, the thighs of bronze). Given this, it's easy to see that Rome is next (legs of iron), followed by a divided Europe into 10 tribes (feet of iron and clay, with 10 toes). And that's just one chapter! If interpreted carefully, the prophecies predict what will happen until the coming of Christ....and after!
I'd say more, but that would take way too long. Put simply, if we were all directed to the Bible as a basis of our knowledge of God, we'd have much fewer problems among anyone, Christians or otherwise.