Mt 18:10 Take heed that ye despise not one of these little ones; for I say unto you, That in heaven their angels do always behold the face of my Father which is in heaven. Every Christian has an angel in Heaven First, the passage does not say that.
It is talking about children, not Christians.
Second, what does that have to do with praying to angels or saints?
"Little ones" are children and "little ones" are Christians. They both subsist on milk until they can eat meat.
You have mis-read my posts on angels, but relax, things are going well.