Christians claim that any prayer request granted for other believers in different religions is done by their God out of compassion, because only one God exists, theirs. The reason Christians think this, despite the fact that only prayers offered in Jesus' name are to be prayed, is because their own answered prayers have no more evidence for them as the others. So their God becomes the explanation for the answered prayers of a Muslim, or an Orthodox Jew, or a Fred Phelps, or a Roman Catholic, or a liberal Christian, or a Jehovah's Witness, or a Mormon, or a Satanist, or a Hindu. But believers in these other religions will take answered prayers as evidence that their faith is true. This means God, the Christian God, is providing confirming evidence against the truth of Christianity to other believers in false religions who will be condemned to hell. So Christian, either give up the belief that your God answers the prayers of other believers, or admit he is helping to send them to hell. And if you give up the belief that God is answering the prayers of other believers, then show us why your own answered prayers have more evidence for them than theirs.
What is missed is that it's assumed that if someone prays a prayer that unless they get what they asked for that God didn't answer their prayer. "NO" is no less an answer than "YES". The other thing that is missing is the realization if someone prays and they get what they wanted that doesn't mean that our God answered it. According to Christianity, people could be praying to and communicating with demons. If you accept what the Bible says about God and angels then you must also accept the existence of demons. We also know that God will allow demons to do things.
The Spirit clearly says that in later times some will abandon the faith and follow deceiving spirits and things taught by demons. - Timothy 4:1
5 Then the devil took Jesus to the holy city. He had him stand on the highest point of the temple. 6 "If you are the Son of God," he said, "throw yourself down. It is written,
" 'The Lord will command his angels to take good care of you.
They will lift you up in their hands.
Then you won't trip over a stone.' " —(Psalm 91:11,12)
7 Jesus answered him, "It is also written, 'Do not put the Lord your God to the test.' "—(Deuteronomy 6:16)
8 Finally, the devil took Jesus to a very high mountain. He showed him all the kingdoms of the world and their glory. 9 "If you bow down and worship me," he said, "I will give you all of this."
10 Jesus said to him, "Get away from me, Satan! It is written, 'Worship the Lord your God. He is the only one you should serve.' "—(Deuteronomy 6:13)
11 Then the devil left Jesus. Angels came and took care of him. - Matthew 4:5-11
Debunking Christianity: Who Answers Prayers?