Why do Christians say these long prayers?Why do Christians take pictures and post them of the good things they do?

You can't make this shit up, lol. They don't read their bibles.

Matthew Chapter 6

¹ Take heed that ye do not your alms before men, to be seen of them: otherwise ye have no reward of your Father which is in heaven.

² Therefore when thou doest thine alms, do not sound a trumpet before thee, as the hypocrites do in the synagogues and in the streets, that they may have glory of men. Verily I say unto you, They have their reward.

³ But when thou doest alms, let not thy left hand know what thy right hand doeth:

⁴ That thine alms may be in secret: and thy Father which seeth in secret himself shall reward thee openly.

⁵ And when thou prayest, thou shalt not be as the hypocrites are: for they love to pray standing in the synagogues and in the corners of the streets, that they may be seen of men. Verily I say unto you, They have their reward.

⁶ But thou, when thou prayest, enter into thy closet, and when thou hast shut thy…